2026 NPPES data Nephrology Physician NPI 1033194733 MD
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WILLIAM LEE, MD

Nephrology 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
251
Medicare Part D claims · 115 beneficiaries · Nephrology Physician avg: 1K
What the federal data reveals: WILLIAM LEE, MD is a Nephrology Physician ([object Object]) practicing in DENVER, Colorado with a Medicare Part D prescribing footprint of 251 claims across 115 beneficiaries .

What stands out: WILLIAM LEE, MD filed 251 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)

WILLIAM LEE, 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).

WILLIAM LEE, MD at a glance

Quality data not reported

NPI registry status

Active

Issued 12/14/2005

NPI 1033194733

Primary specialty

Nephrology Physician

Mid-sized

10,534 US NPIs in this specialty

Medicare Part D claims

251 83% vs specialty avg

2023 prescription claims

Specialty avg: 1,454

Specialty distribution in Colorado

How Nephrology Physician compares to other specialties among Colorado providers

Colorado providers

Nephrology Physician share within Colorado

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

Specialty board-certification context

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

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

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

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

WILLIAM LEE, MD is a Nephrology Physician provider practicing in DENVER, Colorado, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: MD. NPI: 1033194733. 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.

WILLIAM LEE, MD appears in the CMS NPPES registry as a Nephrology Physician provider holding MD credentials at 1375 E 19TH AVE, DENVER, CO, 80218, with a listed phone of (303) 338-4545. NPI 1033194733 was issued on 12/14/2005. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what LEE 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 251 prescription claims written by this provider, covering 115 Medicare beneficiaries and totaling roughly $15K in drug spend, with an opioid prescribing rate of 4.8%. 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.

Nephrology Physician is a mid-sized specialty nationwide, with 10,534 enrolled providers across 55 states and an average of 1,454 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

1375 E 19TH AVE
DENVER, CO 80218

Provider Details

NPI 1033194733
Specialty Nephrology Physician
Credentials MD
Gender Male
NPI Issued 12/14/2005

Hospital and facility affiliations

Facilities where WILLIAM LEE, 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.

COLORADO PERMANENTE MEDICAL GROUP PC
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).

Medicare Part D Prescribing Data

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

251
Total Claims
$15K
Total Drug Cost
115
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
278
Total Day Supply
5,761
Generic Drug Cost
$3K
Opioid Claims
12 (4.8% rate)
Antibiotic Claims
37

Patient Demographics

Average Patient Age
75.7 years
Avg HCC Risk Score
2.29
Gender Split
56% female / 44% male

Top Prescribed Drugs (Medicare Part D)

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

Drug Claims
Furosemide
24
Prednisone
16
Pradaxa
Dabigatran Etexilate Mesylate
11

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

Nephrology Physician Overview

How WILLIAM LEE, MD fits within the Nephrology Physician landscape nationally.

10,534
Nephrology Physician Providers in US
55
States with Nephrology Physician
1,454
Avg Claims per Provider

WILLIAM LEE, MD's 251 claims are below the specialty average of 1,454.

Nearby Nephrology Physician Providers in Colorado

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

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

Frequently Asked Questions

What is WILLIAM LEE, MD's specialty?
WILLIAM LEE, MD specializes in Nephrology Physician and practices in DENVER, Colorado. Credentials: MD.
How much does WILLIAM LEE, MD prescribe under Medicare Part D?
In 2023, WILLIAM LEE, MD wrote 251 Medicare Part D claims totaling $15K in drug costs for 115 beneficiaries.
Where is WILLIAM LEE, MD located?
WILLIAM LEE, MD is located at 1375 E 19TH AVE, DENVER, CO, 80218. Phone: (303) 338-4545.
What is WILLIAM LEE, MD's NPI number?
WILLIAM LEE, MD's National Provider Identifier (NPI) is 1033194733, issued on 12/14/2005.
Does WILLIAM LEE, MD prescribe opioids?
Yes, WILLIAM LEE, MD had 12 opioid claims in 2023 with an opioid prescribing rate of 4.8%.
How many Nephrology Physician providers are there in the US?
There are 10,534 Nephrology Physician providers across 55 states in the US. The average Nephrology Physician provider writes 1,454 Medicare Part D claims per year.
What drugs does WILLIAM LEE, MD prescribe most often?
Based on 2023 Medicare Part D data, WILLIAM LEE, MD's most frequently prescribed drugs include Furosemide, Prednisone, Pradaxa. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does WILLIAM LEE, MD accept Medicare?
WILLIAM LEE, MD appears in CMS Medicare data with 251 Part D claims and 115 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify WILLIAM LEE, MD's credentials?
WILLIAM LEE, MD's NPI is 1033194733 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