2026 NPPES data Internal Medicine Physician NPI 1851666192 MD
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CATHERINE ADAMS, MD

Internal Medicine Physician in NEW HAVEN, Connecticut. 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
39
Medicare Part D claims · 15 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
72%
generic claims · 28% brand-name · higher generic rates reduce patient out-of-pocket costs
What the federal data reveals: CATHERINE ADAMS, MD is a Internal Medicine Physician ([object Object]) practicing in NEW HAVEN, Connecticut with a Medicare Part D prescribing footprint of 39 claims across 15 beneficiaries — 28% brand-name prescribing .

What stands out: CATHERINE ADAMS, MD filed 39 Medicare Part D claims in 2023 across NEW HAVEN, Connecticut. Every figure on this page comes straight from federal CMS records, with no proprietary rating applied.

Board certification likely (heuristic — not verified)

CATHERINE ADAMS, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation — signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).

CATHERINE ADAMS, MD at a glance

Quality data not reported

NPI registry status

Active

Issued 03/20/2012

NPI 1851666192

Primary specialty

Internal Medicine Physician

High-volume

172,858 US NPIs in this specialty

Medicare Part D claims

39 99% vs specialty avg

2023 prescription claims

Specialty avg: 2,716

Specialty distribution in Connecticut

How Internal Medicine Physician compares to other specialties among Connecticut providers

Connecticut providers

Internal Medicine Physician share within Connecticut

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

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).

CATHERINE ADAMS, MD is a Internal Medicine Physician provider practicing in NEW HAVEN, Connecticut, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: MD. NPI: 1851666192. 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.

CATHERINE ADAMS, MD appears in the CMS NPPES registry as a Internal Medicine Physician provider holding MD credentials at 20 YORK ST, NEW HAVEN, CT, 06510, with a listed phone of (203) 688-4242. NPI 1851666192 was issued on 03/20/2012. 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 39 prescription claims written by this provider, covering 15 Medicare beneficiaries and totaling roughly $2K in drug spend, split 28% brand-name and 72% generic by claim count, with an opioid prescribing rate of 46.2%. 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

20 YORK ST
NEW HAVEN, CT 06510

Provider Details

NPI 1851666192
Specialty Internal Medicine Physician
Credentials MD
Gender Female
NPI Issued 03/20/2012

Hospital and facility affiliations

Facilities where CATHERINE 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.

ST. PETER'S HEALTH PARTNERS MEDICAL ASSOCIATES, P.C.
TROY, NY

Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).

Brand vs generic prescribing mix · Above average

CATHERINE ADAMS, MD — brand share 28.0%
Specialty average (est.)

28% brand-name claims vs 72% generic, on 39 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.

39
Total Claims
$2K
Total Drug Cost
15
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
50
Total Day Supply
1,209
Brand vs Generic
28% brand / 72% generic
Brand Drug Cost
$1K
Generic Drug Cost
$1K
Opioid Claims
18 (46.2% rate)

Patient Demographics

Average Patient Age
76.3 years
Avg HCC Risk Score
2.63

Internal Medicine Physician Overview

How CATHERINE 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

CATHERINE ADAMS, MD's 39 claims are below the specialty average of 2,716.

Nearby Internal Medicine Physician Providers in Connecticut

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

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

Frequently Asked Questions

What is CATHERINE ADAMS, MD's specialty?
CATHERINE ADAMS, MD specializes in Internal Medicine Physician and practices in NEW HAVEN, Connecticut. Credentials: MD.
How much does CATHERINE ADAMS, MD prescribe under Medicare Part D?
In 2023, CATHERINE ADAMS, MD wrote 39 Medicare Part D claims totaling $2K in drug costs for 15 beneficiaries.
Where is CATHERINE ADAMS, MD located?
CATHERINE ADAMS, MD is located at 20 YORK ST, NEW HAVEN, CT, 06510. Phone: (203) 688-4242.
What is CATHERINE ADAMS, MD's NPI number?
CATHERINE ADAMS, MD's National Provider Identifier (NPI) is 1851666192, issued on 03/20/2012.
Does CATHERINE ADAMS, MD prescribe more brand-name or generic drugs?
CATHERINE ADAMS, MD's prescribing is 28% brand-name and 72% generic drugs by claim count, with $1K in brand drug costs.
Does CATHERINE ADAMS, MD prescribe opioids?
Yes, CATHERINE ADAMS, MD had 18 opioid claims in 2023 with an opioid prescribing rate of 46.2%.
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 CATHERINE ADAMS, MD accept Medicare?
CATHERINE ADAMS, MD appears in CMS Medicare data with 39 Part D claims and 15 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify CATHERINE ADAMS, MD's credentials?
CATHERINE ADAMS, MD's NPI is 1851666192 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