2026 NPPES data Internal Medicine Physician NPI 1548838535 MD
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NATHANIEL ADAMS, MD

Internal Medicine Physician in HAZELWOOD, Missouri. 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
59
Medicare Part D claims · 18 beneficiaries · Internal Medicine Physician avg: 3K
Industry payments
$128.36
7 payments · CMS Open Payments (Sunshine Act)
What the federal data reveals: NATHANIEL ADAMS, MD is a Internal Medicine Physician ([object Object]) practicing in HAZELWOOD, Missouri with a Medicare Part D prescribing footprint of 59 claims across 18 beneficiaries . Industry payments of $128.36 across 7 transactions are disclosed under CMS Open Payments (Sunshine Act).

What stands out: NATHANIEL ADAMS, MD filed 59 Medicare Part D claims in 2023 across HAZELWOOD, Missouri. Every figure on this page comes straight from federal CMS records, with no proprietary rating applied.

Board certification likely (heuristic — not verified)

NATHANIEL ADAMS, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 2 hospital affiliations — signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).

NATHANIEL ADAMS, MD at a glance

Quality data not reported

NPI registry status

Active

Issued 06/15/2021

NPI 1548838535

Primary specialty

Internal Medicine Physician

High-volume

172,858 US NPIs in this specialty

Medicare Part D claims

59 98% vs specialty avg

2023 prescription claims

Specialty avg: 2,716

Specialty distribution in Missouri

How Internal Medicine Physician compares to other specialties among Missouri providers

Missouri providers

Internal Medicine Physician share within Missouri

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

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).

NATHANIEL ADAMS, MD is a Internal Medicine Physician provider practicing in HAZELWOOD, Missouri, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: MD. NPI: 1548838535. 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.

NATHANIEL ADAMS, MD appears in the CMS NPPES registry as a Internal Medicine Physician provider holding MD credentials at 637 DUNN RD STE 170, HAZELWOOD, MO, 63042, with a listed phone of (636) 838-5702. NPI 1548838535 was issued on 06/15/2021. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what ADAMS 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 59 prescription claims written by this provider, covering 18 Medicare beneficiaries and totaling roughly $5K 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.

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

637 DUNN RD STE 170
HAZELWOOD, MO 63042

Provider Details

NPI 1548838535
Specialty Internal Medicine Physician
Credentials MD
Gender Male
NPI Issued 06/15/2021

Hospital and facility affiliations

Facilities where NATHANIEL ADAMS, MD 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.

AGING WELL HEALTH CARE, LLC
SAINT LOUIS, MO
AMERICAN MULTISPECIALTY GROUP INC
SAINT LOUIS, MO

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 NATHANIEL ADAMS, MD. Source: openpaymentsdata.cms.gov.

Total received

$128

Largest payer

Salix Pharmaceuticals, a division of Bausch Health US, LLC

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.

Medicare Part D Prescribing Data

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

59
Total Claims
$5K
Total Drug Cost
18
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
90
Total Day Supply
2,526
Generic Drug Cost
$1K

Patient Demographics

Average Patient Age
66.2 years
Avg HCC Risk Score
2.22

Internal Medicine Physician Overview

How NATHANIEL ADAMS, 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

NATHANIEL ADAMS, MD's 59 claims are below the specialty average of 2,716.

Nearby Internal Medicine Physician Providers in Missouri

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

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

Frequently Asked Questions

What is NATHANIEL ADAMS, MD's specialty?
NATHANIEL ADAMS, MD specializes in Internal Medicine Physician and practices in HAZELWOOD, Missouri. Credentials: MD.
How much does NATHANIEL ADAMS, MD prescribe under Medicare Part D?
In 2023, NATHANIEL ADAMS, MD wrote 59 Medicare Part D claims totaling $5K in drug costs for 18 beneficiaries.
Where is NATHANIEL ADAMS, MD located?
NATHANIEL ADAMS, MD is located at 637 DUNN RD STE 170, HAZELWOOD, MO, 63042. Phone: (636) 838-5702.
What is NATHANIEL ADAMS, MD's NPI number?
NATHANIEL ADAMS, MD's National Provider Identifier (NPI) is 1548838535, issued on 06/15/2021.
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.
Does NATHANIEL ADAMS, MD accept Medicare?
NATHANIEL ADAMS, MD appears in CMS Medicare data with 59 Part D claims and 18 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify NATHANIEL ADAMS, MD's credentials?
NATHANIEL ADAMS, MD's NPI is 1548838535 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