NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1043475486 MD
Verify on CMS → Azfar Chak, MD
Internal Medicine Physician in Nyack, New York.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 174,792 in Internal Medicine Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
626
Medicare Part D claims · 184 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
86%
generic claims · 14% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
42.4/100
▼ 41 pts below national avg 83.5 · Below average
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Azfar Chak, MD reported a CMS MIPS final score of 42.4/100 - below the 83.5 national average - and filed 626 Medicare Part D claims in 2024.
- 42.4/100
- MIPS score · -41 vs avg
- 626
- Part D claims, 2024
- 86%
- generic prescribing
- Likely
- board-certified (heuristic)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Federal trust snapshot
What official records show about Azfar Chak, MD
Federal records show an active NPI with both Medicare prescribing volume and a measured CMS quality score — objective registry data, not patient reviews.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1043475486), first enumerated 07/24/2008.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 626 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
CMS quality reporting (MIPS)
Reported a CMS MIPS final score of 42.4/100 in the Quality Payment Program — a federal quality measure, not a patient review.
Source: CMS Quality Payment Program
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- State context
State board disciplinary context
New York statewide board action statistics are published annually — these figures describe aggregate state activity, not Azfar Chak, MD's individual license status. Verify directly with the state medical board.
Source: NYSBPMC annual report 2023
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1043475486 · Internal Medicine Physician
NPI-10 · ENUM-MID · TAX-MEGA · MIPS-LOW · RX-LIGHT · BOOK-MID · PHOTO-FINISH
- NPI-10 1043475486
- ENUM-MID 2008
- TAX-MEGA 175K Internal Medicine
- MIPS-LOW 42.4/100
- RX-LIGHT 626
- BOOK-MID 13,725 in New York
- PHOTO-FINISH John Fowler, M.D. · ±0.1
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Dilek Elbistan, …
Dilek Elbistan, M.D.
42.3 MIPS pts
- Chak · this prov…
Chak · this provider
42.4 MIPS pts
- Nader Mahmood, M…
Nader Mahmood, MD
42.5 MIPS pts
- John Fowler, M.D…
John Fowler, M.D.
42.5 MIPS pts
- Aamir Mohammad, …
Aamir Mohammad, MD
42.5 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
Azfar Chak, MD's MIPS score vs every measured U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.
42 ≥ 4th percentile 4% of 454,083 measured providers are in lower value bands
Each bar is a band; taller bars hold more measured providers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
The percentile is a conservative whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Azfar Chak, MD sits
This provider among internal medicine physician peers
Across the 34,612 internal medicine physician providers who report both Medicare Part D prescribing and a MIPS quality score, Azfar Chak, MD writes more Part D claims than 49% of them and scores higher on MIPS quality than 5% - placing this provider in the lower-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Each dot is one internal medicine physician peer from a representative sample of 60; the gold marker is Azfar Chak, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Azfar Chak, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Azfar Chak, MD?
Below national averagePrimary specialty
Internal Medicine Physician
Medicare Part D claims
626 78% vs specialty avg
MIPS final score
42.4/100 41.1 pts vs avg
Specialty distribution in New York
How Internal Medicine Physician compares to other specialties among New York providers
Medicare quality performance, MIPS
Azfar Chak, MD's 2023 MIPS final score plotted against the Internal Medicine Physician national average
- MIPS Final Score
- 42.4/100
- vs 83.5 national avg · 2023 performance year
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Practice Address
Provider Details
| NPI | 1043475486 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 07/24/2008 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
42.3731
Final Score
Measured-score avg: 83.5
51.0512
Quality
39.842
Cost
Reporting: Individual
License & disciplinary context - New York NYSBPMC 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~100K New York medical licensees in 2023 - they are NOT specific to Azfar Chak, MD. To verify Azfar Chak, MD's current license status, search the NYSBPMC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
312
Total board actions, New York 2023
Across 302 cases
3.12
Actions per 1,000 licensees
New York statewide rate
probation
Most common action type
89 cases
NYSBPMC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the New York disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Typical
Azfar Chak, MD - brand share 14.0%
Internal Medicine Physician average
14% brand-name claims vs 86% generic, on 626 2024 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
626
Total Claims
$283K
Total Drug Cost
184
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 882.067
- Total Day Supply
- 17,695
- Brand vs Generic
- 14% brand / 86% generic
- Brand Drug Cost
- $214K
- Generic Drug Cost
- $68K
- Antibiotic Claims
- 457
Patient Demographics
- Average Patient Age
- 75.4 years
- Avg HCC Risk Score
- 2.53
- Gender Split
- 49% female / 51% male
- Age Distribution
- <65: 24, 65-74: 54, 75-84: 71, 85+: 35
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Azfar Chak, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Cefazolin Sodium
Cefazolin Sodium
51 claims
- Ceftriaxone
Ceftriaxone
47 claims
- Doxycycline Hyclate
Doxycycline Hyclate
45 claims
- Vancomycin Hcl
Vancomycin Hcl
44 claims
- Amoxicillin-Clavul…
Amoxicillin-Clavulanate Potass
40 claims
- Sulfamethoxazole-T…
Sulfamethoxazole-Trimethoprim
32 claims
- Fosfomycin Trometh…
Fosfomycin Tromethamine
22 claims
- Nitrofurantoin Mon…
Nitrofurantoin Mono-Macro
22 claims
| Drug | Claims |
|---|---|
| Cefazolin Sodium | 51 |
| Ceftriaxone Ceftriaxone Sodium | 47 |
| Doxycycline Hyclate | 45 |
| Vancomycin Hcl | 44 |
| Amoxicillin-Clavulanate Potass Amoxicillin/Potassium Clav | 40 |
| Sulfamethoxazole-Trimethoprim Sulfamethoxazole/Trimethoprim | 32 |
| Fosfomycin Tromethamine | 22 |
| Nitrofurantoin Mono-Macro Nitrofurantoin Monohyd/M-Cryst | 22 |
| Cefepime Hcl | 21 |
| Daptomycin | 21 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Internal Medicine Physician Overview
How Azfar Chak, MD fits within the Internal Medicine Physician landscape nationally.
174,792
Internal Medicine Physician Providers in US
56
States with Internal Medicine Physician
2,785
Avg Claims per Provider
Azfar Chak, MD's 626 claims are below the specialty average of 2,785.
Nationwide Internal Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Chak, both outside New York so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (42.4 here).
Same NPPES enumeration year (2008)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Internal Medicine Physician Providers in New York
Other clinicians with the same primary specialty enrolled in New York, drawn from the same CMS NPPES roster as Chak.
One of 13,725 Internal Medicine Physician providers enrolled in New York, 5 are shown here.
Dr. Deborah Aanonsen
D.O.
Staten Island, NY
Dr. Nivedita Aanur
M.D.
New York, NY
Dr. Jay Aaron
MD
Great Neck, NY
Dr. Justin Aaron
MD
New York, NY
Ahmad Abadi
Poughkeepsie, NY
Compare Internal Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Azfar Chak, MD's specialty? ▼
Azfar Chak, MD specializes in Internal Medicine Physician and practices in Nyack, New York. Credentials: MD.
How much does Azfar Chak, MD prescribe under Medicare Part D? ▼
In 2024, Azfar Chak, MD wrote 626 Medicare Part D claims totaling $283K in drug costs for 184 beneficiaries.
What is Azfar Chak, MD's Medicare quality score? ▼
Azfar Chak, MD has a CMS MIPS Final Score of 42.4/100 (Quality: 51.1, Cost: 39.8). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Azfar Chak, MD located? ▼
Azfar Chak, MD is located at 311 N MIDLAND AVE, Nyack, NY, 10960. Phone: (845) 358-5006.
What is Azfar Chak, MD's NPI number? ▼
Azfar Chak, MD's National Provider Identifier (NPI) is 1043475486, issued on 07/24/2008.
Does Azfar Chak, MD prescribe more brand-name or generic drugs? ▼
Azfar Chak, MD's prescribing is 14% brand-name and 86% generic drugs by claim count, with $214K in brand drug costs.
How many Internal Medicine Physician providers are there in the US? ▼
There are 174,792 Internal Medicine Physician providers across 56 states in the US. The average Internal Medicine Physician provider writes 2,785 Medicare Part D claims per year.
What drugs does Azfar Chak, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Azfar Chak, MD's most frequently prescribed drugs include Cefazolin Sodium, Ceftriaxone, Doxycycline Hyclate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Azfar Chak, MD accept Medicare? ▼
Azfar Chak, MD appears in CMS Medicare data with 626 Part D claims and 184 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Azfar Chak, MD's credentials? ▼
Azfar Chak, MD's NPI is 1043475486 with credentials MD. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2024). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of August 2026 (NPPES) / 2024 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of August 2026.