2026 NPPES data Internal Medicine Physician NPI 1427044155 MD
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ALAN CLARK, MD

Internal Medicine Physician in GASTONIA, North Carolina. CMS National Plan and Provider Enumeration System profile including specialty classification, practice address, and Medicare prescribing data when reported.

Federal data — no proprietary rating. PlainDoctor publishes the actual CMS NPPES and Medicare records — NPI registration, specialty, practice location, and prescribing data — without a composite score or editorial opinion on top. Every field traces to a federal source.
Prescribing volume
8K
Medicare Part D claims · 93 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
84%
generic claims · 16% brand-name · higher generic rates reduce patient out-of-pocket costs

What the federal data shows

ALAN CLARK, MD filed 7,671 Medicare Part D claims in 2023 as a Internal Medicine Physician in GASTONIA, North Carolina, prescribing 84% generic.

8K
Part D claims, 2023
84%
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.

ALAN CLARK, MD's Medicare Part D volume vs every U.S. prescriber

Total Medicare Part D claims, 2023 — across all CMS prescribers nationally

7,671 Top 3% higher than 97% of 1,370,886 prescribers

0–200: 670,926 prescribers (49%). Below this entry. 200–400: 182,923 prescribers (13%). Below this entry. 400–600: 90,619 prescribers (7%). Below this entry. 600–800: 56,224 prescribers (4%). Below this entry. 800–1,000: 40,919 prescribers (3%). Below this entry. 1,000–1,200: 31,827 prescribers (2%). Below this entry. 1,200–1,400: 26,224 prescribers (2%). Below this entry. 1,400–1,600: 21,710 prescribers (2%). Below this entry. 1,600–1,800: 19,072 prescribers (1%). Below this entry. 1,800–2,000: 16,451 prescribers (1%). Below this entry. 2,000–2,200: 213,991 prescribers (16%). This entry sits in this band. This provider 0 2K+ every Part D prescriber (claims/yr), bucketed by value

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

Board-eligible specialty (heuristic — not verified)

ALAN CLARK, MD 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 ALAN CLARK, MD?

Quality data not reported

NPI registry status

Active

Issued 09/27/2005

NPI 1427044155

Primary specialty

Internal Medicine Physician

High-volume

172,858 US NPIs in this specialty

Medicare Part D claims

7,671 182% vs specialty avg

2023 prescription claims

Specialty avg: 2,716

Specialty distribution in North Carolina

How Internal Medicine Physician compares to other specialties among North Carolina providers

North Carolina providers

Internal Medicine Physician share within North Carolina

1. Internal Medicine Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Internal Medicine Physician share within North Carolina

Specialty board-certification context

Estimated specialty board-certified rate — Internal Medicine Physician (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Internal Medicine Physician ABMS/AOA estimate

Est. board-certified rate (Internal Medicine Physician) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Internal Medicine Physician) — ABMS / AOA estimate

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).

ALAN CLARK, MD appears in the CMS NPPES registry as a Internal Medicine Physician provider holding MD credentials at 1875 REMOUNT RD, GASTONIA, NC, 28054, with a listed phone of (704) 874-0604. NPI 1427044155 was issued on 09/27/2005. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what CLARK most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.

Medicare Part D records for calendar year 2023 show 7,671 prescription claims written by this provider, covering 93 Medicare beneficiaries and totaling roughly $326K in drug spend, split 16% brand-name and 84% generic by claim count, with an opioid prescribing rate of 1.3%. These figures capture only Medicare Part D — commercial insurance, Medicaid, and cash-pay prescriptions are not included, and any drug-beneficiary cell under 11 is suppressed by CMS for patient privacy.

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

1875 REMOUNT RD
GASTONIA, NC 28054

Provider Details

NPI 1427044155
Specialty Internal Medicine Physician
Credentials MD
Gender Male
NPI Issued 09/27/2005

Brand vs generic prescribing mix · Typical

ALAN CLARK, MD — brand share 16.0%
Specialty average (est.)

16% brand-name claims vs 84% generic, on 7,671 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.

7,671
Total Claims
$326K
Total Drug Cost
93
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
7,686
Total Day Supply
103,650
Brand vs Generic
16% brand / 84% generic
Brand Drug Cost
$220K
Generic Drug Cost
$104K
Opioid Claims
98 (1.3% rate)
Antibiotic Claims
183

Patient Demographics

Average Patient Age
76.5 years
Avg HCC Risk Score
3.40
Gender Split
71% female / 29% male

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.

What ALAN CLARK, MD prescribes most

Top Medicare Part D drugs by claim count, 2023

claims
Source CMS Medicare Part D Prescriber Public Use File As of 2023
Drug Claims
Pantoprazole Sodium
331
Furosemide
327
Gabapentin
254
Levothyroxine Sodium
240
Sertraline Hcl
215
Atorvastatin Calcium
197
Omeprazole
194
Januvia
Sitagliptin Phosphate
193
Metoprolol Tartrate
182
Prednisone
180

* 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 ALAN CLARK, MD 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

ALAN CLARK, MD's 7,671 claims are above the specialty average of 2,716.

Nearby Internal Medicine Physician Providers in North Carolina

Other clinicians with the same primary specialty enrolled in North Carolina, drawn from the same CMS NPPES roster as CLARK.

Compare Internal Medicine Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is ALAN CLARK, MD's specialty?
ALAN CLARK, MD specializes in Internal Medicine Physician and practices in GASTONIA, North Carolina. Credentials: MD.
How much does ALAN CLARK, MD prescribe under Medicare Part D?
In 2023, ALAN CLARK, MD wrote 7,671 Medicare Part D claims totaling $326K in drug costs for 93 beneficiaries.
Where is ALAN CLARK, MD located?
ALAN CLARK, MD is located at 1875 REMOUNT RD, GASTONIA, NC, 28054. Phone: (704) 874-0604.
What is ALAN CLARK, MD's NPI number?
ALAN CLARK, MD's National Provider Identifier (NPI) is 1427044155, issued on 09/27/2005.
Does ALAN CLARK, MD prescribe more brand-name or generic drugs?
ALAN CLARK, MD's prescribing is 16% brand-name and 84% generic drugs by claim count, with $220K in brand drug costs.
Does ALAN CLARK, MD prescribe opioids?
Yes, ALAN CLARK, MD had 98 opioid claims in 2023 with an opioid prescribing rate of 1.3%.
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 ALAN CLARK, MD prescribe most often?
Based on 2023 Medicare Part D data, ALAN CLARK, MD's most frequently prescribed drugs include Pantoprazole Sodium, Furosemide, Gabapentin. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does ALAN CLARK, MD accept Medicare?
ALAN CLARK, MD appears in CMS Medicare data with 7,671 Part D claims and 93 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify ALAN CLARK, MD's credentials?
ALAN CLARK, MD's NPI is 1427044155 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

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