2026 NPPES data Rheumatology Physician NPI 1851351845 M.D.
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MARILYN CLARK, M.D.

Rheumatology Physician in TEMPLE, Texas. 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
4K
Medicare Part D claims · 408 beneficiaries · Rheumatology Physician avg: 2K
Industry payments
$54.99
1 payments · CMS Open Payments (Sunshine Act)

What the federal data shows

MARILYN CLARK, M.D. filed 3,779 Medicare Part D claims in 2023 as a Rheumatology Physician in TEMPLE, Texas.

4K
Part D claims, 2023
$54.99
industry payments (Sunshine Act)

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.

MARILYN CLARK, M.D.'s Medicare Part D volume vs every U.S. prescriber

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

3,779 Top 9% higher than 91% 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)

MARILYN CLARK, 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 MARILYN CLARK, M.D.?

Quality data not reported

NPI registry status

Active

Issued 03/24/2006

NPI 1851351845

Primary specialty

Rheumatology Physician

Mid-sized

6,181 US NPIs in this specialty

Medicare Part D claims

3,779 84% vs specialty avg

2023 prescription claims

Specialty avg: 2,054

Specialty distribution in Texas

How Rheumatology Physician compares to other specialties among Texas providers

Texas providers

Rheumatology Physician share within Texas

1. Rheumatology Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Rheumatology Physician share within Texas

Specialty board-certification context

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

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

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

0%100%78%
Est. board-certified rate (Rheumatology 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).

MARILYN CLARK, M.D. appears in the CMS NPPES registry as a Rheumatology Physician provider holding M.D. credentials at 2401 S 31ST ST, TEMPLE, TX, 76508, with a listed phone of (254) 724-2111. NPI 1851351845 was issued on 03/24/2006. 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 3,779 prescription claims written by this provider, covering 408 Medicare beneficiaries and totaling roughly $4.6 million in drug spend. 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.

Rheumatology Physician is a mid-sized specialty nationwide, with 6,181 enrolled providers across 52 states and an average of 2,054 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

2401 S 31ST ST
TEMPLE, TX 76508

Provider Details

NPI 1851351845
Specialty Rheumatology Physician
Credentials M.D.
Gender Female
NPI Issued 03/24/2006

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 MARILYN CLARK, M.D.. Source: openpaymentsdata.cms.gov.

Total received

$55

Largest payer

Janssen Biotech, Inc.

Most common payment type

Education

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.

License & disciplinary context — Texas TMB 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 ~77K Texas medical licensees in 2023 — they are NOT specific to MARILYN CLARK, M.D.. To verify MARILYN CLARK, M.D.'s current license status, search the TMB public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.

344
Total board actions, Texas 2023
Across 334 cases
4.47
Actions per 1,000 licensees
Texas statewide rate
probation
Most common action type
94 cases

TMB 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 Texas disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.

Medicare Part D Prescribing Data

CMS Medicare Part D prescriber-level data for calendar year 2023.

3,779
Total Claims
$4.6M
Total Drug Cost
408
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
7,008
Total Day Supply
205,220
Generic Drug Cost
$144K
Antibiotic Claims
47

Patient Demographics

Average Patient Age
69.0 years
Avg HCC Risk Score
1.81
Gender Split
76% female / 24% male
Age Distribution
<65: 106, 65-74: 169, 75-84: 107, 85+: 26

Top Prescribed Drugs (Medicare Part D)

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

What MARILYN CLARK, M.D. 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
Prednisone
538
Hydroxychloroquine Sulfate
418
Methotrexate
Methotrexate Sodium
380
Leflunomide
197
Enbrel Sureclick
Etanercept
187
Sulfasalazine Dr
Sulfasalazine
154
Azathioprine
108
Gabapentin
102
Duloxetine Hcl
94
Humira(Cf) Pen
Adalimumab
87

* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.

Rheumatology Physician Overview

How MARILYN CLARK, M.D. fits within the Rheumatology Physician landscape nationally.

6,181
Rheumatology Physician Providers in US
52
States with Rheumatology Physician
2,054
Avg Claims per Provider

MARILYN CLARK, M.D.'s 3,779 claims are above the specialty average of 2,054.

Nearby Rheumatology Physician Providers in Texas

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

Compare Rheumatology Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is MARILYN CLARK, M.D.'s specialty?
MARILYN CLARK, M.D. specializes in Rheumatology Physician and practices in TEMPLE, Texas. Credentials: M.D..
How much does MARILYN CLARK, M.D. prescribe under Medicare Part D?
In 2023, MARILYN CLARK, M.D. wrote 3,779 Medicare Part D claims totaling $4.6M in drug costs for 408 beneficiaries.
Where is MARILYN CLARK, M.D. located?
MARILYN CLARK, M.D. is located at 2401 S 31ST ST, TEMPLE, TX, 76508. Phone: (254) 724-2111.
What is MARILYN CLARK, M.D.'s NPI number?
MARILYN CLARK, M.D.'s National Provider Identifier (NPI) is 1851351845, issued on 03/24/2006.
How many Rheumatology Physician providers are there in the US?
There are 6,181 Rheumatology Physician providers across 52 states in the US. The average Rheumatology Physician provider writes 2,054 Medicare Part D claims per year.
What drugs does MARILYN CLARK, M.D. prescribe most often?
Based on 2023 Medicare Part D data, MARILYN CLARK, M.D.'s most frequently prescribed drugs include Prednisone, Hydroxychloroquine Sulfate, Methotrexate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does MARILYN CLARK, M.D. accept Medicare?
MARILYN CLARK, M.D. appears in CMS Medicare data with 3,779 Part D claims and 408 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify MARILYN CLARK, M.D.'s credentials?
MARILYN CLARK, M.D.'s NPI is 1851351845 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

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