2026 NPPES data Geriatric Medicine (Internal Medicine) Physician NPI 1801037726 M.D.
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ELIZABETH CLARKE, M.D.

Geriatric Medicine (Internal Medicine) Physician in DENVER, Colorado. 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
5K
Medicare Part D claims · 476 beneficiaries · Geriatric Medicine (Internal Medicine) Physician avg: 4K
Generic prescribing
81%
generic claims · 19% brand-name · higher generic rates reduce patient out-of-pocket costs
What the federal data reveals: ELIZABETH CLARKE, M.D. is a Geriatric Medicine (Internal Medicine) Physician ([object Object]) practicing in DENVER, Colorado with a Medicare Part D prescribing footprint of 5K claims across 476 beneficiaries — 19% brand-name prescribing .

What stands out: ELIZABETH CLARKE, M.D. filed 5,395 Medicare Part D claims in 2023 across DENVER, Colorado. Every figure on this page comes straight from federal CMS records, with no proprietary rating applied.

Board certification likely (heuristic — not verified)

ELIZABETH CLARKE, M.D. 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).

ELIZABETH CLARKE, M.D. at a glance

Quality data not reported

NPI registry status

Active

Issued 03/23/2009

NPI 1801037726

Primary specialty

Geriatric Medicine (Internal Medicine) Physician

Niche

4,161 US NPIs in this specialty

Medicare Part D claims

5,395 21% vs specialty avg

2023 prescription claims

Specialty avg: 4,450

Specialty distribution in Colorado

How Geriatric Medicine (Internal Medicine) Physician compares to other specialties among Colorado providers

Colorado providers

Geriatric Medicine (Internal Medicine) Physician share within Colorado

1. Geriatric Medicine (Internal Medicine) Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Geriatric Medicine (Internal Medicine) Physician share within Colorado

Specialty board-certification context

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

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

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

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

ELIZABETH CLARKE, M.D. is a Geriatric Medicine (Internal Medicine) Physician provider practicing in DENVER, Colorado, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: M.D.. NPI: 1801037726. 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.

ELIZABETH CLARKE, M.D. appears in the CMS NPPES registry as a Geriatric Medicine (Internal Medicine) Physician provider holding M.D. credentials at 777 BANNOCK ST, DENVER, CO, 80204, with a listed phone of (303) 436-4949. NPI 1801037726 was issued on 03/23/2009. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what CLARKE 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 5,395 prescription claims written by this provider, covering 476 Medicare beneficiaries and totaling roughly $737K in drug spend, split 19% brand-name and 81% generic by claim count, with an opioid prescribing rate of 2.5%. 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.

Geriatric Medicine (Internal Medicine) Physician is a narrow specialty nationwide, with 4,161 enrolled providers across 52 states and an average of 4,450 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

777 BANNOCK ST
DENVER, CO 80204

Provider Details

NPI 1801037726
Specialty Geriatric Medicine (Internal Medicine) Physician
Credentials M.D.
Gender Female
NPI Issued 03/23/2009

Hospital and facility affiliations

Facilities where ELIZABETH CLARKE, 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.

DENVER HEALTH AND HOSPITAL AUTHORITY
DENVER, CO

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 · Typical

ELIZABETH CLARKE, M.D. — brand share 19.0%
Specialty average (est.)

19% brand-name claims vs 81% generic, on 5,395 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.

5,395
Total Claims
$737K
Total Drug Cost
476
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
13,864
Total Day Supply
409,839
Brand vs Generic
19% brand / 81% generic
Brand Drug Cost
$630K
Generic Drug Cost
$104K
Opioid Claims
136 (2.5% rate)
Antibiotic Claims
48

Patient Demographics

Average Patient Age
74.9 years
Avg HCC Risk Score
1.44
Gender Split
62% female / 38% male
Age Distribution
<65: 16, 65-74: 237, 75-84: 162, 85+: 61

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
438
Amlodipine Besylate
307
Lisinopril
270
Losartan Potassium
246
Levothyroxine Sodium
233
Omeprazole
203
Tamsulosin Hcl
134
Sertraline Hcl
120
Diclofenac Sodium
117
Metformin Hcl
110

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

Geriatric Medicine (Internal Medicine) Physician Overview

How ELIZABETH CLARKE, M.D. fits within the Geriatric Medicine (Internal Medicine) Physician landscape nationally.

4,161
Geriatric Medicine (Internal Medicine) Physician Providers in US
52
States with Geriatric Medicine (Internal Medicine) Physician
4,450
Avg Claims per Provider

ELIZABETH CLARKE, M.D.'s 5,395 claims are above the specialty average of 4,450.

Nearby Geriatric Medicine (Internal Medicine) Physician Providers in Colorado

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

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

Frequently Asked Questions

What is ELIZABETH CLARKE, M.D.'s specialty?
ELIZABETH CLARKE, M.D. specializes in Geriatric Medicine (Internal Medicine) Physician and practices in DENVER, Colorado. Credentials: M.D..
How much does ELIZABETH CLARKE, M.D. prescribe under Medicare Part D?
In 2023, ELIZABETH CLARKE, M.D. wrote 5,395 Medicare Part D claims totaling $737K in drug costs for 476 beneficiaries.
Where is ELIZABETH CLARKE, M.D. located?
ELIZABETH CLARKE, M.D. is located at 777 BANNOCK ST, DENVER, CO, 80204. Phone: (303) 436-4949.
What is ELIZABETH CLARKE, M.D.'s NPI number?
ELIZABETH CLARKE, M.D.'s National Provider Identifier (NPI) is 1801037726, issued on 03/23/2009.
Does ELIZABETH CLARKE, M.D. prescribe more brand-name or generic drugs?
ELIZABETH CLARKE, M.D.'s prescribing is 19% brand-name and 81% generic drugs by claim count, with $630K in brand drug costs.
Does ELIZABETH CLARKE, M.D. prescribe opioids?
Yes, ELIZABETH CLARKE, M.D. had 136 opioid claims in 2023 with an opioid prescribing rate of 2.5%.
How many Geriatric Medicine (Internal Medicine) Physician providers are there in the US?
There are 4,161 Geriatric Medicine (Internal Medicine) Physician providers across 52 states in the US. The average Geriatric Medicine (Internal Medicine) Physician provider writes 4,450 Medicare Part D claims per year.
What drugs does ELIZABETH CLARKE, M.D. prescribe most often?
Based on 2023 Medicare Part D data, ELIZABETH CLARKE, M.D.'s most frequently prescribed drugs include Atorvastatin Calcium, Amlodipine Besylate, Lisinopril. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does ELIZABETH CLARKE, M.D. accept Medicare?
ELIZABETH CLARKE, M.D. appears in CMS Medicare data with 5,395 Part D claims and 476 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify ELIZABETH CLARKE, M.D.'s credentials?
ELIZABETH CLARKE, M.D.'s NPI is 1801037726 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