NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1801892294 MD
Verify on CMS → Martha Gray, MD
Internal Medicine Physician in Ann Arbor, Michigan.
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
12K
Medicare Part D claims · 973 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
88%
generic claims · 11% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Martha Gray, MD filed 11,537 Medicare Part D claims in 2024 as an Internal Medicine Physician in Ann Arbor, Michigan, prescribing 88% generic.
- 12K
- Part D claims, 2024
- 88%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥98th
- pct by Part D claim volume (lower-bound band)
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 Martha Gray, MD
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1801892294), first enumerated 06/22/2005.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 11,537 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- 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.
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- State context
State board disciplinary context
Michigan statewide board action statistics are published annually — these figures describe aggregate state activity, not Martha Gray, MD's individual license status. Verify directly with the state medical board.
Source: MI-BOM 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.
Compare Gray with other Internal Medicine Physician providers
Same primary specialty, same federal CMS NPPES roster.
All 845 Internal Medicine Physician providers in Ann Arbor, MI →
Also enrolled in Michigan
- Dr. Keith Aaronson, MD Ann Arbor, MI
- Dr. Tomas Abalo, M.D. Iron Mountain, MI
- Dr. Ali Abbas, M.D. Pontiac, MI
- Dr. Hawazin Abbas, MD Auburn Hills, MI
- Dr. Imran Abbasi, D.O. Warren, MI
- Dr. Ramzi Abbasi, MD Saginaw, MI
Other specialties in Ann Arbor: Student in an Organized Health Care Education/Training Program (1,584) · Clinical Social Worker (1,145) · Behavior Technician (1,024) · Physician Assistant (543)
CMS NPPES provider registry desk
NPI 1801892294 · Internal Medicine Physician
NPI-10 · ENUM-LEGACY · TAX-MEGA · RX-HEAVY · BOOK-MID · PHOTO-ENUM
- NPI-10 1801892294
- ENUM-LEGACY 2005
- TAX-MEGA 175K Internal Medicine
- RX-HEAVY 12K claims
- BOOK-MID 6,589 in Michigan
- PHOTO-ENUM Edward Thomas, M.D. · 2005
Martha Gray, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
11,537 ≥ 98th percentile 98% of 1,416,883 prescribers are in lower value bands
Each bar is a band; taller bars hold more prescribers. 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 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2024
✓
Board certification likely (heuristic, not verified)
Martha Gray, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - 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 Martha Gray, MD?
Quality data not reportedPrimary specialty
Internal Medicine Physician
Medicare Part D claims
11,537 314% vs specialty avg
Specialty distribution in Michigan
How Internal Medicine Physician compares to other specialties among Michigan providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Internal Medicine Physician. Verify directly:
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 | 1801892294 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 06/22/2005 |
Hospital and facility affiliations
Facilities where Martha Gray, MD bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Partners IN Internal Medicine PLLC
Ann Arbor, MI
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
License & disciplinary context - Michigan MI-BOM 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 ~41K Michigan medical licensees in 2023 - they are NOT specific to Martha Gray, MD. To verify Martha Gray, MD's current license status, search the MI-BOM public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
123
Total board actions, Michigan 2023
Across 120 cases
3.00
Actions per 1,000 licensees
Michigan statewide rate
probation
Most common action type
44 cases
MI-BOM 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 Michigan disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Typical
Martha Gray, MD - brand share 11.0%
Internal Medicine Physician average
11% brand-name claims vs 88% generic, on 11,537 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.
11,537
Total Claims
$853K
Total Drug Cost
973
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 28,785.867
- Total Day Supply
- 851,836
- Brand vs Generic
- 11% brand / 88% generic
- Brand Drug Cost
- $654K
- Generic Drug Cost
- $188K
- Opioid Claims
- 18 (0.2% rate)
- Antibiotic Claims
- 178
Patient Demographics
- Average Patient Age
- 76.3 years
- Avg HCC Risk Score
- 0.95
- Gender Split
- 84% female / 16% male
- Age Distribution
- <65: 16, 65-74: 405, 75-84: 405, 85+: 147
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Martha Gray, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Atorvastatin Calcium
Atorvastatin Calcium
897 claims
- Levothyroxine Sodium
Levothyroxine Sodium
662 claims
- Amlodipine Besylate
Amlodipine Besylate
661 claims
- Lisinopril
Lisinopril
629 claims
- Losartan Potassium
Losartan Potassium
554 claims
- Hydrochlorothiazide
Hydrochlorothiazide
506 claims
- Simvastatin
Simvastatin
390 claims
- Lovastatin
Lovastatin
363 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 897 |
| Levothyroxine Sodium | 662 |
| Amlodipine Besylate | 661 |
| Lisinopril | 629 |
| Losartan Potassium | 554 |
| Hydrochlorothiazide | 506 |
| Simvastatin | 390 |
| Lovastatin | 363 |
| Metformin Hcl | 342 |
| Omeprazole | 331 |
* 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 Martha Gray, 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
Martha Gray, MD's 11,537 claims are above the specialty average of 2,785.
Nationwide Internal Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Gray, both outside Michigan so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2005)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Internal Medicine Physician Providers in Michigan
Other clinicians with the same primary specialty enrolled in Michigan, drawn from the same CMS NPPES roster as Gray.
One of 6,589 Internal Medicine Physician providers enrolled in Michigan, 11 are shown on this page.
Dr. Saadat Abbasi
MD
Kalamazoo, MI
Dr. Shahzaman Abbasi
MD
Lansing, MI
Dr. Youssef Abbiss
D.O.
Mount Clemens, MI
Dr. Joseph Abbo
MD
Ypsilanti, MI
Dr. Valerie Abbott
MD
Southfield, MI
Compare Internal Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Martha Gray, MD's specialty? ▼
Martha Gray, MD specializes in Internal Medicine Physician and practices in Ann Arbor, Michigan. Credentials: MD.
How much does Martha Gray, MD prescribe under Medicare Part D? ▼
In 2024, Martha Gray, MD wrote 11,537 Medicare Part D claims totaling $853K in drug costs for 973 beneficiaries.
Where is Martha Gray, MD located? ▼
Martha Gray, MD is located at 2200 GREEN RD, Ann Arbor, MI, 48105. Phone: (734) 994-7446.
What is Martha Gray, MD's NPI number? ▼
Martha Gray, MD's National Provider Identifier (NPI) is 1801892294, issued on 06/22/2005.
Does Martha Gray, MD prescribe more brand-name or generic drugs? ▼
Martha Gray, MD's prescribing is 11% brand-name and 88% generic drugs by claim count, with $654K in brand drug costs.
Does Martha Gray, MD prescribe opioids? ▼
Yes, Martha Gray, MD had 18 opioid claims in 2024 with an opioid prescribing rate of 0.2%.
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 Martha Gray, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Martha Gray, MD's most frequently prescribed drugs include Atorvastatin Calcium, Levothyroxine Sodium, Amlodipine Besylate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Martha Gray, MD accept Medicare? ▼
Martha Gray, MD appears in CMS Medicare data with 11,537 Part D claims and 973 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Martha Gray, MD's credentials? ▼
Martha Gray, MD's NPI is 1801892294 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.
- 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.