2026 NPPES data Internal Medicine Physician NPI 1134431935 M.D.
Verify on CMS →

MARY BAKER, M.D.

Internal Medicine Physician in GEORGETOWN, South 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
6K
Medicare Part D claims · 452 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
91%
generic claims · 9% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
97.0252/100
▲ 14 pts above national avg 83.1 · [object Object]
Industry payments
$58.56
2 payments · CMS Open Payments (Sunshine Act)
What the federal data reveals: MARY BAKER, M.D. is a Internal Medicine Physician ([object Object]) practicing in GEORGETOWN, South Carolina with a Medicare Part D prescribing footprint of 6K claims across 452 beneficiaries — 9% brand-name prescribing . Their CMS MIPS Final Score of 97.0252/100 (national average: 83.1) reflects performance across Quality, Cost, Interoperability, and Improvement Activities . Industry payments of $58.56 across 2 transactions are disclosed under CMS Open Payments (Sunshine Act).

What stands out: MARY BAKER, M.D. reported a CMS MIPS final score of 97.0252 out of 100, above the 83.1 national average, and filed 5,864 Medicare Part D claims in 2023. Every figure on this page comes straight from federal CMS records, with no proprietary rating applied.

Board certification likely (heuristic — not verified)

MARY BAKER, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 2 hospital affiliations — signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).

MARY BAKER, M.D. at a glance

High performer (top quartile)

NPI registry status

Active

Issued 07/08/2010

NPI 1134431935

Primary specialty

Internal Medicine Physician

High-volume

172,858 US NPIs in this specialty

Medicare Part D claims

5,864 116% vs specialty avg

2023 prescription claims

Specialty avg: 2,716

MIPS final score

97.0252/100 13.925200000000004% pts

Exceptional band

vs 83.1 national avg

Specialty distribution in South Carolina

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

South Carolina providers

Internal Medicine Physician share within South Carolina

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

Medicare quality performance — MIPS

MARY BAKER, M.D.'s 2023 MIPS final score plotted against the Internal Medicine Physician national average

High performer (top quartile)
MIPS Final Score
97.0252/100
vs 83.1 national avg · 2023 performance year

MIPS final score (Internal Medicine Physician) — 97.0252/100 vs national avg 83.1

0%100%National avg83%97%
MIPS final score (Internal Medicine Physician) — 97.0252/100 vs national avg 83.1

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).

MARY BAKER, M.D. is a Internal Medicine Physician provider practicing in GEORGETOWN, South Carolina, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: M.D.. NPI: 1134431935. This profile includes practice location, specialty classification, and organizational affiliations from the CMS provider registry. Provider information is self-reported to CMS and updated monthly.

MARY BAKER, M.D. appears in the CMS NPPES registry as a Internal Medicine Physician provider holding M.D. credentials at 422 N FRASER ST, GEORGETOWN, SC, 29440, with a listed phone of (843) 436-1333. NPI 1134431935 was issued on 07/08/2010. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what BAKER 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 5,864 prescription claims written by this provider, covering 452 Medicare beneficiaries and totaling roughly $389K in drug spend, split 9% brand-name and 91% generic by claim count, with an opioid prescribing rate of 1.6%. 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. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 97.0252/100 for the 2023 performance year (Quality 94.0503), compared with the national average of 83.1.

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

422 N FRASER ST
GEORGETOWN, SC 29440

Provider Details

NPI 1134431935
Specialty Internal Medicine Physician
Credentials M.D.
Gender Female
NPI Issued 07/08/2010

CMS Quality Score (MIPS)

Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.

97.0252
Final Score
Avg: 83.1
94.0503
Quality

Reporting: Individual

Hospital and facility affiliations

Facilities where MARY BAKER, M.D. 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.

LITTLE RIVER MEDICAL CENTER INC
MYRTLE BEACH, SC
ST JAMES HEALTH AND WELLNESS INC
MC CLELLANVILLE, SC

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 MARY BAKER, M.D.. Source: openpaymentsdata.cms.gov.

Total received

$59

Largest payer

Corcept Therapeutics

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 · Generic-heavy

MARY BAKER, M.D. — brand share 9.0%
Specialty average (est.)

9% brand-name claims vs 91% generic, on 5,864 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.

5,864
Total Claims
$389K
Total Drug Cost
452
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
14,239
Total Day Supply
415,789
Brand vs Generic
9% brand / 91% generic
Brand Drug Cost
$266K
Generic Drug Cost
$123K
Opioid Claims
96 (1.6% rate)
Antibiotic Claims
178

Patient Demographics

Average Patient Age
74.1 years
Avg HCC Risk Score
0.90
Gender Split
71% female / 29% male
Age Distribution
<65: 17, 65-74: 214, 75-84: 186, 85+: 35

Top Prescribed Drugs (Medicare Part D)

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

Drug Claims
Atorvastatin Calcium
363
Levothyroxine Sodium
209
Simvastatin
195
Metoprolol Succinate
183
Amlodipine Besylate
180
Lisinopril
177
Pantoprazole Sodium
152
Hydrochlorothiazide
143
Escitalopram Oxalate
134
Losartan Potassium
133

* 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 MARY BAKER, 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

MARY BAKER, M.D.'s 5,864 claims are above the specialty average of 2,716.

Nearby Internal Medicine Physician Providers in South Carolina

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

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

Frequently Asked Questions

What is MARY BAKER, M.D.'s specialty?
MARY BAKER, M.D. specializes in Internal Medicine Physician and practices in GEORGETOWN, South Carolina. Credentials: M.D..
How much does MARY BAKER, M.D. prescribe under Medicare Part D?
In 2023, MARY BAKER, M.D. wrote 5,864 Medicare Part D claims totaling $389K in drug costs for 452 beneficiaries.
What is MARY BAKER, M.D.'s Medicare quality score?
MARY BAKER, M.D. has a CMS MIPS Final Score of 97.0252/100 (Quality: 94.0503). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is MARY BAKER, M.D. located?
MARY BAKER, M.D. is located at 422 N FRASER ST, GEORGETOWN, SC, 29440. Phone: (843) 436-1333.
What is MARY BAKER, M.D.'s NPI number?
MARY BAKER, M.D.'s National Provider Identifier (NPI) is 1134431935, issued on 07/08/2010.
Does MARY BAKER, M.D. prescribe more brand-name or generic drugs?
MARY BAKER, M.D.'s prescribing is 9% brand-name and 91% generic drugs by claim count, with $266K in brand drug costs.
Does MARY BAKER, M.D. prescribe opioids?
Yes, MARY BAKER, M.D. had 96 opioid claims in 2023 with an opioid prescribing rate of 1.6%.
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 MARY BAKER, M.D. prescribe most often?
Based on 2023 Medicare Part D data, MARY BAKER, M.D.'s most frequently prescribed drugs include Atorvastatin Calcium, Levothyroxine Sodium, Simvastatin. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does MARY BAKER, M.D. accept Medicare?
MARY BAKER, M.D. appears in CMS Medicare data with 5,864 Part D claims and 452 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify MARY BAKER, M.D.'s credentials?
MARY BAKER, M.D.'s NPI is 1134431935 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.
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