20 Cumberland Hill Road Suite 104
Woonsocket RI 02895
Medical School: Other - 1991
Accepts Medicare: Yes
Participates In eRX: No
Participates In PQRS: No
Participates In EHR: Yes
License #: MD11507
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Awards & Recognitions
Dr. Irfan Ahmad is associated with these group practices
|HCPCS Code||Description||Average Price||Average Price
Allowed By Medicare
|HCPCS Code:94010||Description:Breathing capacity test||Average Price:$122.00||Average Price Allowed
|HCPCS Code:93000||Description:Electrocardiogram complete||Average Price:$85.00||Average Price Allowed
|HCPCS Code:99222||Description:Initial hospital care||Average Price:$200.00||Average Price Allowed
|HCPCS Code:99239||Description:Hospital discharge day||Average Price:$150.00||Average Price Allowed
|HCPCS Code:99214||Description:Office/outpatient visit est||Average Price:$145.00||Average Price Allowed
|HCPCS Code:G0438||Description:PPPS, initial visit||Average Price:$207.73||Average Price Allowed
|HCPCS Code:99213||Description:Office/outpatient visit est||Average Price:$105.00||Average Price Allowed
|HCPCS Code:99232||Description:Subsequent hospital care||Average Price:$100.00||Average Price Allowed
|HCPCS Code:99305||Description:Nursing facility care init||Average Price:$155.00||Average Price Allowed
|HCPCS Code:G0439||Description:PPPS, subseq visit||Average Price:$138.00||Average Price Allowed
|HCPCS Code:99309||Description:Nursing fac care subseq||Average Price:$110.00||Average Price Allowed
|HCPCS Code:G0008||Description:Admin influenza virus vac||Average Price:$30.00||Average Price Allowed
HCPCS Code Definitions
- Electrocardiogram, routine ECG with at least 12 leads; with interpretation and report
- Spirometry, including graphic record, total and timed vital capacity, expiratory flow rate measurement(s), with or without maximal voluntary ventilation
- Office or other outpatient visit for the evaluation and management of an established patient, which requires at least 2 of these 3 key components: An expanded problem focused history; An expanded problem focused examination; Medical decision making of low complexity. Counseling and coordination of care with other physicians, other qualified health care professionals, or agencies are provided consistent with the nature of the problem(s) and the patient's and/or family's needs. Usually, the presenting problem(s) are of low to moderate severity. Typically, 15 minutes are spent face-to-face with the patient and/or family.
- Office or other outpatient visit for the evaluation and management of an established patient, which requires at least 2 of these 3 key components: A detailed history; A detailed examination; Medical decision making of moderate complexity. Counseling and/or coordination of care with other physicians, other qualified health care professionals, or agencies are provided consistent with the nature of the problem(s) and the patient's and/or family's needs. Usually, the presenting problem(s) are of moderate to high severity. Typically, 25 minutes are spent face-to-face with the patient and/or family.
- Initial hospital care, per day, for the evaluation and management of a patient, which requires these 3 key components: A comprehensive history; A comprehensive examination; and Medical decision making of moderate complexity. Counseling and/or coordination of care with other physicians, other qualified health care professionals, or agencies are provided consistent with the nature of the problem(s) and the patient's and/or family's needs. Usually, the problem(s) requiring admission are of moderate severity. Typically, 50 minutes are spent at the bedside and on the patient's hospital floor or unit.
- Subsequent hospital care, per day, for the evaluation and management of a patient, which requires at least 2 of these 3 key components: An expanded problem focused interval history; An expanded problem focused examination; Medical decision making of moderate complexity. Counseling and/or coordination of care with other physicians, other qualified health care professionals, or agencies are provided consistent with the nature of the problem(s) and the patient's and/or family's needs. Usually, the patient is responding inadequately to therapy or has developed a minor complication. Typically, 25 minutes are spent at the bedside and on the patient's hospital floor or unit.
- Hospital discharge day management; more than 30 minutes
- Initial nursing facility care, per day, for the evaluation and management of a patient, which requires these 3 key components: A comprehensive history; A comprehensive examination; and Medical decision making of moderate complexity. Counseling and/or coordination of care with other physicians, other qualified health care professionals, or agencies are provided consistent with the nature of the problem(s) and the patient's and/or family's needs. Usually, the problem(s) requiring admission are of moderate severity. Typically, 35 minutes are spent at the bedside and on the patient's facility floor or unit.
- Subsequent nursing facility care, per day, for the evaluation and management of a patient, which requires at least 2 of these 3 key components: A detailed interval history; A detailed examination; Medical decision making of moderate complexity. Counseling and/or coordination of care with other physicians, other qualified health care professionals, or agencies are provided consistent with the nature of the problem(s) and the patient's and/or family's needs. Usually, the patient has developed a significant complication or a significant new problem. Typically, 25 minutes are spent at the bedside and on the patient's facility floor or unit.
- Administration of influenza virus vaccine
- Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit
- Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit
Medical Malpractice Cases
Medical Board Sanctions
Cardiovascular Disease (Cardiology)
Cardiovascular Disease (Cardiology)
Cardiovascular Disease (Cardiology)
Cardiovascular Disease (Cardiology)
*These referrals represent the top 10 that Dr. Ahmad has made to other doctors
Highly efficient donor-acceptor hydrazone dyes-inorganic Si/TiOâ‚‚ hybrid solar cells. - Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy
We have synthesized the two donor-bridge-acceptor organic dyes (hydrazone dye 1 (HD1) and hydrazone dye 2 (HD2)) with the aim to enhance intra-molecular charge transfer then characterized by FTIR and NMR. The ground state geometries have been optimized at three different levels of theories, i.e., B3LYP/6-31G, B3LYP/6-31G and Hartee-Fock HF/6-31G. The absorption spectra and oscillator strengths in different solvents have been computed and compared with the experimental data. The vibrational spectral assignments have been performed on the recorded FTIR spectra based on the theoretical predicted wavenumbers at three different levels of theories. The effect of different solvents (CHCl3, CH3CN and C2H5OH) has been studied on the absorption wavelengths. Furthermore, we have computed the ionization potentials, electron affinities and reorganization energies of studied compounds and shed light on the charge transport properties. The hetero-junction solar cell devices were fabricated by organic-inorganic hetero-junction (Si/TiO2/dye) then the efficiency has been measured by applying the incident power 30, 50 and 70 mW/cm(2). The maximum efficiency 3.12% has been observed for HD1.Copyright Â© 2015 Elsevier B.V. All rights reserved.
Diradical character and nonlinear optical properties of buckyferrocenes: focusing on the use of suitably modified fullerene fragments. - Physical chemistry chemical physics : PCCP
The buckyferrocenes, synthesized through face-to-face fusion of ferrocene and fullerene fragments (C60Me10), are expected to enjoy the rich scientific heritage of ferrocene and fullerene with an extensively large Ï€-conjugation network between the two Fe atoms [Y. Matsuo, K. Tahara and E. Nakamura, J. Am. Chem. Soc., 2006, 128, 7154]. However, the addition of pentamethyl groups at each end of the fullerene fragment breaks the Ï€-conjugation path as well as metal-metal spin correlation between the two-ferrocene faces in a buckyferrocene. We found that the unblocking of Ï€-conjugation from different positions in fullerene fragments have substantial effects on their topologies, spin densities, diradical characters as well as nonlinear optical (NLO) properties of these buckyferrocenes. We study the topological dependence of open-shell diradical character and second hyperpolarizability (Î³), the third-order NLO properties at the molecular scale, in several buckyferrocenes. On the basis of their different diradical characters (yi), which are defined by the occupation number of the lowest unoccupied natural orbital (LUNO) + i (i = 0, 1,â€¦), these buckyferrocenes are categorized into three groups, i.e., closed-shell (yi = 0), intermediate open-shell singlet (0 < yi < 1), and almost pure open-shell singlet (yi = 1) compounds. For example, we found that buckyferrocenes including (CpFe)2Î·(5)C60Me10 and (CpFe)2Î·(5)C70Me10 have closed-shell configurations. The buckyferrocenes (CpFe)2Î·(5)C60, (CpFe)2Î·(5)C70, (CpFe)2Î·(5)C70Me8, (CpFe)2Î·(5)C70Me4 and (CpFe)2Î·(5)C30 are intermediate open-shell singlet, while (CpFe)2Î·(5)C60Me4 and (CpFe)2Î·(5)C60Me8 are pure open-shell singlet complexes. Interestingly, the Î³zzzz amplitude of (CpFe)2Î·(5)C60, an open-shell intermediate diradical complex, is about 41 times and 13 times as large as those of its closed-shell ((CpFe)2Î·(5)C60Me10) and pure diradical ((CpFe)2Î·(5)C60Me8) counterparts, respectively. Similarly, the Î³zzzz amplitudes of (CpFe)2Î·(5)C70, (CpFe)2Î·(5)C70Me4, and (CpFe)2Î·(5)C70Me8 with intermediate diradical character are about 36, 17, and 9 times as large as that of their closed-shell (CpFe)2Î·(5)C70Me10 counterpart. The fact that larger Î³zzzz values are obtained for buckyferrocenes with intermediate diradical characters is in line with the "y-Î³ correlation" obtained from the valence configuration interaction (VCI) results for a two-site diradical model [M. Nakano, et al., Phys. Rev. Lett., 2007, 99, 033001] as well as for fullerene and graphene systems. The Î³zzzz density analysis shows that the large positive contributions originate from the large Î³zzzz density distributions on the upper- and lower-extended edges of the buckyferrocenes, between which significant spin polarizations appear within the spin-unrestricted DFT level of theory. These results demonstrate that such buckyferrocenes are potential candidates for a novel class of open-shell singlet NLO systems, where Î³zzzz values are modulated by tuning their diradical character through the use of suitably modified fullerene fragments.
How does the increment of hetero-cyclic conjugated moieties affect electro-optical and charge transport properties of novel naphtha-difuran derivatives? A computational approach. - Journal of molecular modeling
We have investigated computationally the effects of Ï€-conjugation extension on naphtha[2,1-b:6,5-b'] difuran (DPNDF); where we increase the number of fused NDF (central core) and furan rings in the parent molecule. The molecular structures of all analogues have been optimized at the ground (S0) and first excited (S1) states using density functional theory (DFT) and time-dependent density functional theory (TD-DFT), respectively. Then highest occupied molecular orbitals (HOMOs), the lowest unoccupied molecular orbitals (LUMOs), photophysical properties, adiabatic/vertical electron affinities (EAa)/(EAv), adiabatic/vertical ionization potentials (IPa)/(IPv), and hole/electron reorganization energies Î»h/Î»e have been investigated. The effect of NDF and furan rings on structural and electro-optical properties has also been studied. Our calculated reorganization energies of 1a, 1b, and 2c reveal them, materials with balanced hole/electron charge transport, whereas 2a and 2b are good hole-transport materials. By increasing the number of furan rings; the photostability was augmented in 2a, 2b, and 2c.
Regulation of biofilm formation in Salmonella enterica serovar Typhimurium. - Future microbiology
In animals, plants and the environment, Salmonella enterica serovar Typhimurium forms the red dry and rough (rdar) biofilm characterized by extracellular matrix components curli and cellulose. With complex expression control by at least ten transcription factors, the bistably expressed orphan response regulator CsgD directs rdar morphotype development. CsgD expression is an integral part of the Hfq regulon and the complex cyclic diguanosine monophosphate signaling network partially controlled by the global RNA-binding protein CsrA. Cell wall turnover and the periplasmic redox status regulate csgD expression on a post-transcriptional level by unknown mechanisms. Furthermore, phosphorylation of CsgD is a potential inactivation and degradation signal in biofilm dissolution. Including complex incoherent feed-forward loops, regulation of biofilm formation versus motility and virulence is of recognized complexity.
An electro-optical and electron injection study of benzothiazole-based squaraine dyes as efficient dye-sensitized solar cell materials: a first principles study. - Journal of molecular modeling
Squaraine dyes have attracted significant attention in many areas of daily life from biomedical imaging to semiconducting materials. Moreover, these dyes are used as photoactive materials in the field of solar cells. In the present study, we investigated the structural, electronic, photophysical, and charge transport properties of six benzothiazole-based squaraine dyes (Cis-SQ1-Cis-SQ3 and Trans-SQ1-Trans-SQ3). The effect of electron donating (-OCH3) and electron withdrawing (-COOH) groups was investigated intensively. Ground state geometry and frequency calculations were performed by applying density functional theory (DFT) at B3LYP/6-31G** level of theory. Absorption spectra were computed in chloroform at the time-dependent DFT/B3LYP/6-31G** level of theory. The driving force of electron injection (Î”G (inject)), relative driving force of electron injection (Î”G r (inject)), electronic coupling constants (|VRP|) and light harvesting efficiency (LHE) of all six compounds were calculated and compared with previously studied sensitizers. The Î”G (inject), Î”G r (inject) and |VRP| of all six compounds revealed that these sensitizers would be efficient dye-sensitized solar cell materials. Cis/Trans-SQ3 exhibited superior LHE as compared to other derivatives. The Cis/Trans geometric effect was studied and discussed with regard to electro-optical and charge transport properties.
How does hybrid bridging core modification enhance the nonlinear optical properties in donor-Ï€-acceptor configuration? A case study of dinitrophenol derivatives. - Journal of computational chemistry
This study spotlights the fundamental insights about the structure and static first hyperpolarizability (Î²) of a series of 2,4-dinitrophenol derivatives (1-5), which are designed by novel bridging core modifications. The central bridging core modifications show noteworthy effects to modulate the optical and nonlinear optical properties in these derivatives. The derivative systems show significantly large amplitudes of first hyperpolarizability as compared to parent system 1, which are 4, 46, 66, and 90% larger for systems 2, 3, 4, and 5, respectively, at Moller-Plesset (MP2)/6-31G* level of theory. The static first hyperpolarizability and frequency dependent coupled-perturbed Kohn-Sham first hyperpolarizability are calculated by means of MP2 and density functional theory methods and compared with respective experimental values wherever possible. Using two-level model with full-set of parameters dependence of transition energy (Î”Î•), transition dipole moment (Î¼(0)) as well as change in dipole moment from ground to excited state (Î”Î¼), the origin of increase in Î² amplitudes is traced from the change in dipole moment from ground to excited state. The causes of change in dipole moments are further discovered through sum of Mulliken atomic charges and intermolecular charge transfer spotted in frontier molecular orbitals analysis. Additionally, analysis of conformational isomers and UV-Visible spectra has been also performed for all designed derivatives. Thus, our present investigation provides novel and explanatory insights on the chemical nature and origin of intrinsic nonlinear optical (NLO) properties of 2,4-dinitrophenol derivatives.Â© 2014 Wiley Periodicals, Inc.
A dual approach to study the electro-optical properties of a noncentrosymmetric L-asparagine monohydrate. - Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy
In this work we reports the experimental and theoretical investigation on an organic noncentrosymmetric monohydrated L-asparagine (LAM) molecule. LAM single crystals were grown in specially designed beaker for the first time. Structural confirmation was done by identifying the vibrational modes using IR and FT-Raman spectroscopic studies. The ultra violet-visible-near infrared absorbance, diffuse reflectance spectra were recorded in the spectral range 190-2500 nm. The optical transparency was calculated and found to be âˆ¼80%. Its optical band gap was calculated found to be âˆ¼5.100 eV. Density functional theory (DFT) was employed to optimize the molecular geometry of LAM using B3LYP/6-31G(âˆ—) basis set of theory. The HOMO-LUMO energy gap of 6.047 eV and transition energy of 176 nm (f0=0.024) have been found in semi-quantitative agreement with our experimental results. The dipole moment, polarizability and first hyperpolarizability were calculated at the same level of theory. The obtained results reveals that the titled compound can be a decent contender for nonlinear applications.Copyright Â© 2014 Elsevier B.V. All rights reserved.
Description of Goffartia phalacra n. sp. (Diplogastridae: Nematoda) from India. - Journal of nematology
A new species, Goffartia phalacra n. sp. is described and illustrated. The body is thin and slender with L = 511 to 646 Î¼m; a = 37.1 to 47.4; b = 4.8 to 6; c = 2.6 to 4.8; c' = 13.6 to 32.8; V = 40% to 49% in females. Males are smaller but similar to females and the posterior region is strongly curved. The species is characterized by a tubular stoma, a smooth round lip region, anterior pharynx much smaller than posterior pharynx, two pairs of unicellular glands associated with the vagina, and males with a broad keel-shaped gubernaculum. G. phalacra n. sp. can be differentiated from all other species of the genus by its lip region and the structure of the gubernaculum. This is the first instance of a species of Goffartia occurring in a terrestrial habitat and the first report of a species from India.
GIL, a new c-di-GMP-binding protein domain involved in regulation of cellulose synthesis in enterobacteria. - Molecular microbiology
In contrast to numerous enzymes involved in c-di-GMP synthesis and degradation in enterobacteria, only a handful of c-di-GMP receptors/effectors have been identified. In search of new c-di-GMP receptors, we screened the Escherichia coliâ€…ASKA overexpression gene library using the Differential Radial Capillary Action of Ligand Assay (DRaCALA) with fluorescently and radioisotope-labelled c-di-GMP. We uncovered three new candidate c-di-GMP receptors in E. coli and characterized one of them, BcsE. The bcsE gene is encoded in cellulose synthase operons in representatives of Gammaproteobacteria and Betaproteobacteria. The purified BcsE proteins from E. coli, Salmonella enterica and Klebsiella pneumoniae bind c-di-GMP via the domain of unknown function, DUF2819, which is hereby designated GIL, GGDEF I-site like domain. The RxGD motif of the GIL domain is required for c-di-GMP binding, similar to the c-di-GMP-binding I-site of the diguanylate cyclase GGDEF domain. Thus, GIL is the second protein domain, after PilZ, dedicated to c-di-GMP-binding. We show that in S.â€…enterica, BcsE is not essential for cellulose synthesis but is required for maximal cellulose production, and that c-di-GMP binding is critical for BcsE function. It appears that cellulose production in enterobacteria is controlled by a two-tiered c-di-GMP-dependent system involving BcsE and the PilZ domain containing glycosyltransferase BcsA.Â© 2014 John Wiley & Sons Ltd.
Serum zinc levels and its association with vitamin A levels among tuberculosis patients. - Journal of natural science, biology, and medicine
One-third of the total human population is infected with the Mycobacterium tuberculosis. This bacterium causes illness in up to 9 million people annually and is responsible for three deaths every minute world-wide.To determine the association of serum zinc level with vitamin A level in active pulmonary tuberculosis (TB) cases.It was a cross-sectional study of 208 active pulmonary TB patients aged 18-55 years. Blood samples were obtained from these patients to determine the serum zinc and serum retinol levels.The mean age of the patients was 30.56 (Â±11.38) years ranging from 18 years to 55 years. More than half (54.3%) of the patients were males and 63% were married. Body mass index of the patients was 18.40 Â± 3.10. The serum zinc and vitamin A levels among the patients were 9.60 (Â±0.86) Î¼mol/l and 0.77 (Â±0.22) Î¼mol/l respectively. However, haemoglobin, white blood cell, erythrocyte sedimentation rate, and serum albumin were 10.02 (Â±1.33) g/dl, 10076.01 (Â±1822.67) cell/mm3, 14.50 (Â±2.95) mm/h and 3.40 (Â±0.32) g/dl respectively. There was a strong correlation between serum zinc and vitamin A levels (r = 0.86, P < 0.01). Vitamin A levels were not significantly different among the different age groups; however, this was significantly (P = 0.001) higher in male (0.82 Â± 0.23, 95% confidence interval [CI] =0.77-0.86) patients as compared to females (0.71 Â± 0.20, 95% CI = 0.67-0.75).Zinc deficiency may indirectly influence the metabolism of Vitamin A via reduction of the levels of circulating proteins.
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20 Cumberland Hill Road Suite 104 Woonsocket, RI 02895
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