NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1144267352 M.D.
Verify on CMS → Robert Clinton, M.D.
Internal Medicine Physician in Portland, Maine.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 172,858 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
6K
Medicare Part D claims · 268 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
74%
generic claims · 25% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Robert Clinton, M.D. filed 6,172 Medicare Part D claims in 2023 as a Internal Medicine Physician in Portland, Maine, prescribing 74% generic.
- 6K
- Part D claims, 2023
- 74%
- generic prescribing
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.
Robert Clinton, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
6,172 Top 5% higher than 95% of 1,370,886 prescribers
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.
Source CMS Medicare Part D Prescriber Public Use File · 2023
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Board-eligible specialty (heuristic, not verified)
Robert Clinton, M.D. practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Robert Clinton, M.D.?
Quality data not reportedPrimary specialty
Internal Medicine Physician
Medicare Part D claims
6,172 127% vs specialty avg
Specialty distribution in Maine
How Internal Medicine Physician compares to other specialties among Maine 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).
Robert Clinton, M.D. appears in the CMS NPPES registry as a Internal Medicine Physician provider holding M.D. credentials at 144 STATE ST, Portland, ME, 04101, with a listed phone of (207) 741-0504. NPI 1144267352 was issued on 05/31/2006.
Medicare Part D records for calendar year 2023 show 6,172 prescription claims written by this provider, covering 268 Medicare beneficiaries and totaling roughly $511K in drug spend, split 25% brand-name and 74% generic by claim count, with an opioid prescribing rate of 3.4%.
Internal Medicine Physician is a high-volume specialty nationwide, with 172,858 enrolled providers across 56 states and an average of 2,716 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 | 1144267352 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 05/31/2006 |
Brand vs generic prescribing mix · Above average
Robert Clinton, M.D. - brand share 25.0%
Internal Medicine Physician average
25% brand-name claims vs 74% generic, on 6,172 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.
6,172
Total Claims
$511K
Total Drug Cost
268
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 6,189
- Total Day Supply
- 134,345
- Brand vs Generic
- 25% brand / 74% generic
- Brand Drug Cost
- $316K
- Generic Drug Cost
- $194K
- Opioid Claims
- 210 (3.4% rate)
- Antibiotic Claims
- 194
Patient Demographics
- Average Patient Age
- 79.5 years
- Avg HCC Risk Score
- 2.63
- Gender Split
- 66% female / 34% male
- Age Distribution
- <65: 28, 65-74: 57, 75-84: 79, 85+: 104
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Robert Clinton, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Furosemide
Furosemide
330 claims
- Levothyroxine Sodium
Levothyroxine Sodium
269 claims
- Trazodone Hcl
Trazodone Hcl
247 claims
- Potassium Chloride
Potassium Chloride
195 claims
- Atorvastatin Calcium
Atorvastatin Calcium
175 claims
- Eliquis
Eliquis
169 claims
- Gabapentin 123
Gabapentin
123 claims
- Metoprolol Succinate 118
Metoprolol Succinate
118 claims
| Drug | Claims |
|---|---|
| Furosemide | 330 |
| Levothyroxine Sodium | 269 |
| Trazodone Hcl | 247 |
| Potassium Chloride | 195 |
| Atorvastatin Calcium | 175 |
| Eliquis Apixaban | 169 |
| Gabapentin | 123 |
| Metoprolol Succinate | 118 |
| Diclofenac Sodium | 117 |
| Lisinopril | 110 |
* 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 Robert Clinton, M.D. fits within the Internal Medicine Physician landscape nationally.
172,858
Internal Medicine Physician Providers in US
56
States with Internal Medicine Physician
2,716
Avg Claims per Provider
Robert Clinton, M.D.'s 6,172 claims are above the specialty average of 2,716.
Nearby Internal Medicine Physician Providers in Maine
Other clinicians with the same primary specialty enrolled in Maine, drawn from the same CMS NPPES roster as Clinton.
Dr. Christopher Abbott
D.O.
Lewiston, ME
Dr. Karen Abernathy
M.D.
Rockport, ME
Dr. Hassan Abouleish
MD
Houlton, ME
Dr. Philip Abraham
M.D.
Kittery, ME
Dr. Alexander Abud
MD
Rockport, ME
Compare Internal 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 Maine medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Internal 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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Frequently Asked Questions
What is Robert Clinton, M.D.'s specialty? ▼
Robert Clinton, M.D. specializes in Internal Medicine Physician and practices in Portland, Maine. Credentials: M.D..
How much does Robert Clinton, M.D. prescribe under Medicare Part D? ▼
In 2023, Robert Clinton, M.D. wrote 6,172 Medicare Part D claims totaling $511K in drug costs for 268 beneficiaries.
Where is Robert Clinton, M.D. located? ▼
Robert Clinton, M.D. is located at 144 STATE ST, Portland, ME, 04101. Phone: (207) 741-0504.
What is Robert Clinton, M.D.'s NPI number? ▼
Robert Clinton, M.D.'s National Provider Identifier (NPI) is 1144267352, issued on 05/31/2006.
Does Robert Clinton, M.D. prescribe more brand-name or generic drugs? ▼
Robert Clinton, M.D.'s prescribing is 25% brand-name and 74% generic drugs by claim count, with $316K in brand drug costs.
Does Robert Clinton, M.D. prescribe opioids? ▼
Yes, Robert Clinton, M.D. had 210 opioid claims in 2023 with an opioid prescribing rate of 3.4%.
How many Internal Medicine Physician providers are there in the US? ▼
There are 172,858 Internal Medicine Physician providers across 56 states in the US. The average Internal Medicine Physician provider writes 2,716 Medicare Part D claims per year.
What drugs does Robert Clinton, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Robert Clinton, M.D.'s most frequently prescribed drugs include Furosemide, Levothyroxine Sodium, Trazodone Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Robert Clinton, M.D. accept Medicare? ▼
Robert Clinton, M.D. appears in CMS Medicare data with 6,172 Part D claims and 268 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Robert Clinton, M.D.'s credentials? ▼
Robert Clinton, M.D.'s NPI is 1144267352 with credentials M.D.. 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.
- 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
Compiled from official public sources by the PlainDoctor editorial team.