NPI registry status
Active
2026 NPPES data Family Medicine Physician NPI 1427164201 MD
Verify on CMS → Tonya Gray, MD
Family Medicine Physician in Mason City, Iowa.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 150,125 in Family 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
4K
Medicare Part D claims · 356 beneficiaries · Family Medicine Physician avg: 4K
Industry payments
$16.17
1 payments · CMS Open Payments (Sunshine Act)
What the federal data shows
Tonya Gray, MD filed 3,703 Medicare Part D claims in 2024 as a Family Medicine Physician in Mason City, Iowa.
- 4K
- Part D claims, 2024
- Likely
- board-certified (heuristic)
- ≥91st
- 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 Tonya 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 1427164201), first enumerated 08/22/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 3,703 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
- Reported
Industry payment transparency
$16.17 in reported industry payments (1 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- 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 1427164201 · Family Medicine Physician
NPI-10 · ENUM-LEGACY · TAX-MEGA · RX-MID · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1427164201
- ENUM-LEGACY 2006
- TAX-MEGA 150K Family Medicine
- RX-MID 3,703
- BOOK-LIGHT 2,300 in Iowa
- PHOTO-ENUM Edward Gomez-Seoane · 2006
Tonya Gray, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
3,703 ≥ 91st percentile 91% 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)
Tonya 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 Tonya Gray, MD?
Quality data not reportedPrimary specialty
Family Medicine Physician
Medicare Part D claims
3,703 5% vs specialty avg
Specialty distribution in Iowa
How Family Medicine Physician compares to other specialties among Iowa 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 Family 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 | 1427164201 |
|---|---|
| Specialty | Family Medicine Physician |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 08/22/2006 |
Hospital and facility affiliations
Facilities where Tonya 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.
North Iowa Mercy Clinics
Mason City, IA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Tonya Gray, MD. Source: openpaymentsdata.cms.gov.
Total received
$16
Largest payer
Boston Scientific Corporation
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
3,703
Total Claims
$247K
Total Drug Cost
356
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 8,636.967
- Total Day Supply
- 251,359
- Generic Drug Cost
- $40K
- Opioid Claims
- 70 (1.9% rate)
- Antibiotic Claims
- 53
Patient Demographics
- Average Patient Age
- 73.4 years
- Avg HCC Risk Score
- 0.94
- Gender Split
- 76% female / 24% male
- Age Distribution
- <65: 24, 65-74: 190, 75-84: 107, 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 Tonya Gray, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Atorvastatin Calcium
Atorvastatin Calcium
346 claims
- Losartan Potassium
Losartan Potassium
202 claims
- Levothyroxine Sodium
Levothyroxine Sodium
179 claims
- Omeprazole
Omeprazole
143 claims
- Lisinopril 136
Lisinopril
136 claims
- Hydrochlorothiazide 118
Hydrochlorothiazide
118 claims
- Amlodipine Besylate 112
Amlodipine Besylate
112 claims
- Rosuvastatin Calcium 101
Rosuvastatin Calcium
101 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 346 |
| Losartan Potassium | 202 |
| Levothyroxine Sodium | 179 |
| Omeprazole | 143 |
| Lisinopril | 136 |
| Hydrochlorothiazide | 118 |
| Amlodipine Besylate | 112 |
| Rosuvastatin Calcium | 101 |
| Metoprolol Succinate | 96 |
| Benazepril Hcl | 67 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Family Medicine Physician Overview
How Tonya Gray, MD fits within the Family Medicine Physician landscape nationally.
150,125
Family Medicine Physician Providers in US
56
States with Family Medicine Physician
3,519
Avg Claims per Provider
Tonya Gray, MD's 3,703 claims are above the specialty average of 3,519.
Nationwide Family Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Gray, both outside Iowa so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Family Medicine Physician Providers in Iowa
Other clinicians with the same primary specialty enrolled in Iowa, drawn from the same CMS NPPES roster as Gray.
One of 2,300 Family Medicine Physician providers enrolled in Iowa, 5 are shown here.
Dr. Jennifer Aanestad
M.D.
Durant, IA
Dr. Amjad Abdelhady
MD
Sioux City, IA
Dr. Afsana Abdullah
D.O.
Bettendorf, IA
Dr. Raja Ali Abdullah
MD
Cedar Falls, IA
Dr. Laura Abels
DO
Ankeny, IA
Compare Family Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Tonya Gray, MD's specialty? ▼
Tonya Gray, MD specializes in Family Medicine Physician and practices in Mason City, Iowa. Credentials: MD.
How much does Tonya Gray, MD prescribe under Medicare Part D? ▼
In 2024, Tonya Gray, MD wrote 3,703 Medicare Part D claims totaling $247K in drug costs for 356 beneficiaries.
Where is Tonya Gray, MD located? ▼
Tonya Gray, MD is located at 1010 4TH ST SW, Mason City, IA, 50401. Phone: (641) 422-6020.
What is Tonya Gray, MD's NPI number? ▼
Tonya Gray, MD's National Provider Identifier (NPI) is 1427164201, issued on 08/22/2006.
Does Tonya Gray, MD prescribe opioids? ▼
Yes, Tonya Gray, MD had 70 opioid claims in 2024 with an opioid prescribing rate of 1.9%.
How many Family Medicine Physician providers are there in the US? ▼
There are 150,125 Family Medicine Physician providers across 56 states in the US. The average Family Medicine Physician provider writes 3,519 Medicare Part D claims per year.
What drugs does Tonya Gray, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Tonya Gray, MD's most frequently prescribed drugs include Atorvastatin Calcium, Losartan Potassium, Levothyroxine Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Tonya Gray, MD accept Medicare? ▼
Tonya Gray, MD appears in CMS Medicare data with 3,703 Part D claims and 356 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Tonya Gray, MD's credentials? ▼
Tonya Gray, MD's NPI is 1427164201 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.