NPI registry status
Active
2026 NPPES data Family Medicine Physician NPI 1891892477 MD
Verify on CMS → William Hamilton, MD
Family Medicine Physician in Calhoun, Georgia.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 147,760 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
8K
Medicare Part D claims · 385 beneficiaries · Family Medicine Physician avg: 3K
Generic prescribing
87%
generic claims · 12% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
83.1/100
▼ 0 pts below national avg 83.5 · Above neutral
Industry payments
$419.06
23 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
William Hamilton, MD reported a CMS MIPS final score of 83.1/100 - below the 83.5 national average - and filed 7,780 Medicare Part D claims in 2023.
- 83.1/100
- MIPS score · 0 vs avg
- 8K
- Part D claims, 2023
- 87%
- 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.
William Hamilton, 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.
83 ≥ 39th percentile 39% 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 William Hamilton, MD sits
This provider among family medicine physician peers
Across the 21,266 family medicine physician providers who report both Medicare Part D prescribing and a MIPS quality score, William Hamilton, MD writes more Part D claims than 81% of them and scores higher on MIPS quality than 37% - placing this provider in the high-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one family medicine physician peer from a representative sample of 60; the gold marker is William Hamilton, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
William Hamilton, 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 William Hamilton, MD?
Near national averagePrimary specialty
Family Medicine Physician
Medicare Part D claims
7,780 128% vs specialty avg
MIPS final score
83.1/100 0.4 pts vs avg
Specialty distribution in Georgia
How Family Medicine Physician compares to other specialties among Georgia providers
Medicare quality performance, MIPS
William Hamilton, MD's 2023 MIPS final score plotted against the Family Medicine Physician national average
- MIPS Final Score
- 83.1/100
- vs 83.5 national avg · 2023 performance year
MIPS final score (Family Medicine Physician) - 83.1/100 vs national avg 83.5
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).
William Hamilton, MD appears in the CMS NPPES registry as a Family Medicine Physician provider holding MD credentials at 400 TIMMS RD NE, Calhoun, GA, 30701, with a listed phone of (706) 625-0022. NPI 1891892477 was issued on 09/17/2006.
Medicare Part D records for calendar year 2023 show 7,780 prescription claims written by this provider, covering 385 Medicare beneficiaries and totaling roughly $627K in drug spend, split 12% brand-name and 87% generic by claim count, with an opioid prescribing rate of 1.9%. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 83.1/100 for the 2023 performance year (Quality 68.9, Cost 69.6), compared with the 83.5 average among clinicians with a measured score.
Family Medicine Physician is a high-volume specialty nationwide, with 147,760 enrolled providers across 56 states and an average of 3,418 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1891892477 |
|---|---|
| Specialty | Family Medicine Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 09/17/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
83.0866
Final Score
Measured-score avg: 83.5
68.9068
Quality
69.5763
Cost
100
Promoting Interoperability
Reporting: Group practice
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 William Hamilton, MD. Source: openpaymentsdata.cms.gov.
Total received
$419
Largest payer
Amgen Inc.
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.
Brand vs generic prescribing mix · Typical
William Hamilton, MD - brand share 12.0%
Family Medicine Physician average
12% brand-name claims vs 87% generic, on 7,780 2023 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 2023.
7,780
Total Claims
$627K
Total Drug Cost
385
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 14,923
- Total Day Supply
- 436,005
- Brand vs Generic
- 12% brand / 87% generic
- Brand Drug Cost
- $538K
- Generic Drug Cost
- $84K
- Opioid Claims
- 150 (1.9% rate)
- Antibiotic Claims
- 54
Patient Demographics
- Average Patient Age
- 70.7 years
- Avg HCC Risk Score
- 1.29
- Gender Split
- 43% female / 57% male
- Age Distribution
- <65: 88, 65-74: 154, 75-84: 106, 85+: 37
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What William Hamilton, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
442 claims
- Lisinopril
Lisinopril
396 claims
- Levothyroxine Sodium
Levothyroxine Sodium
374 claims
- Omeprazole
Omeprazole
332 claims
- Amlodipine Besylate
Amlodipine Besylate
310 claims
- Tamsulosin Hcl
Tamsulosin Hcl
222 claims
- Metformin Hcl
Metformin Hcl
201 claims
- Trazodone Hcl
Trazodone Hcl
196 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 442 |
| Lisinopril | 396 |
| Levothyroxine Sodium | 374 |
| Omeprazole | 332 |
| Amlodipine Besylate | 310 |
| Tamsulosin Hcl | 222 |
| Metformin Hcl | 201 |
| Trazodone Hcl | 196 |
| Metoprolol Tartrate | 186 |
| Losartan Potassium | 182 |
* 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 William Hamilton, MD fits within the Family Medicine Physician landscape nationally.
147,760
Family Medicine Physician Providers in US
56
States with Family Medicine Physician
3,418
Avg Claims per Provider
William Hamilton, MD's 7,780 claims are above the specialty average of 3,418.
Nearby Family Medicine Physician Providers in Georgia
Other clinicians with the same primary specialty enrolled in Georgia, drawn from the same CMS NPPES roster as Hamilton.
Dr. Hayden Aaron
MD
Atlanta, GA
Dr. Margaret Abate
MD
Covington, GA
Dr. Suzanne Abbasi
MD
Grovetown, GA
Dr. Zia Abdi
MD
Atlanta, GA
Dr. Hamdi Abdirahman
MD
Dahlonega, GA
Compare Family Medicine Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Georgia medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Family Medicine Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
In-Network vs Out-of-Network
How insurance networks affect your costs
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Explore Georgia
Frequently Asked Questions
What is William Hamilton, MD's specialty? ▼
William Hamilton, MD specializes in Family Medicine Physician and practices in Calhoun, Georgia. Credentials: MD.
How much does William Hamilton, MD prescribe under Medicare Part D? ▼
In 2023, William Hamilton, MD wrote 7,780 Medicare Part D claims totaling $627K in drug costs for 385 beneficiaries.
What is William Hamilton, MD's Medicare quality score? ▼
William Hamilton, MD has a CMS MIPS Final Score of 83.1/100 (Quality: 68.9, Cost: 69.6). 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 William Hamilton, MD located? ▼
William Hamilton, MD is located at 400 TIMMS RD NE, Calhoun, GA, 30701. Phone: (706) 625-0022.
What is William Hamilton, MD's NPI number? ▼
William Hamilton, MD's National Provider Identifier (NPI) is 1891892477, issued on 09/17/2006.
Does William Hamilton, MD prescribe more brand-name or generic drugs? ▼
William Hamilton, MD's prescribing is 12% brand-name and 87% generic drugs by claim count, with $538K in brand drug costs.
Does William Hamilton, MD prescribe opioids? ▼
Yes, William Hamilton, MD had 150 opioid claims in 2023 with an opioid prescribing rate of 1.9%.
How many Family Medicine Physician providers are there in the US? ▼
There are 147,760 Family Medicine Physician providers across 56 states in the US. The average Family Medicine Physician provider writes 3,418 Medicare Part D claims per year.
What drugs does William Hamilton, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, William Hamilton, MD's most frequently prescribed drugs include Atorvastatin Calcium, Lisinopril, Levothyroxine Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does William Hamilton, MD accept Medicare? ▼
William Hamilton, MD appears in CMS Medicare data with 7,780 Part D claims and 385 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify William Hamilton, MD's credentials? ▼
William Hamilton, MD's NPI is 1891892477 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 (2023). 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 April 2026 (NPPES) / 2023 (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 May 2026.