William M. Kubaska, M.D.
Internal Medicine Physician · Denver, CO
William M. Kubaska, M.D. is an internal medicine physician with a practice address in Denver, Colorado, and NPI 1548345101, issued on Oct 25, 2006. Check the license (Colorado 35530, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- William M. Kubaska
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 35530 CO
Self-reported in NPPES; status is on the state search - Practice location
- 4545 E 9TH Ave, Denver, CO 80220
- Phone
- (303) 320-7340
- Enumerated
- Oct 25, 2006
- Record last updated
- Mar 17, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (303) 320-7341
- Medicaid ID
- 01355304 CO
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,046 in Colorado → Look up another NPI →
Also registered at 4545 E 9TH Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Merrilynn Artman, CNMAdvanced Practice Midwife1114086220
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- Sarah Chase, CNMAdvanced Practice Midwife1881682706
- Cara Dawson, M.D.Internal Medicine Physician1023193604
- Melissa EngPharmacist1285901165
- Donna Fisher, AUDIOLOGIST CCC-AAudiologist-Hearing Aid Fitter1194963470
Verify William M. Kubaska in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 35530Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.3 times the Medicare Part D claims of the average internal medicine physician in 2024
7,442 Medicare Part D claims for 501 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 379 claims were for opioids.
Most prescribed
- Atorvastatin Calcium606 claims
- Levothyroxine Sodium383 claims
- Amlodipine Besylate342 claims
- Lisinopril260 claims
- Losartan Potassium203 claims
- Zolpidem Tartrate178 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 14.9 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $17.01
1 payment: food and beverage; the largest payer was GlaxoSmithKline, LLC. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
William M. Kubaska among 2,046 internal medicine physician records in Colorado
William M. Kubaska, M.D. is one of 2,046 internal medicine physician records with a practice address in Colorado. 71% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 60% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileNo · 53% of these records are
- Record last updated2008 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
493 internal medicine physician records list a practice address in Denver
They are 493 of the 25,068 NPPES records with a practice address in Denver, and 2,046 internal medicine physician records in Colorado.
All 2,046 in Colorado → Every provider in Denver → Internal Medicine Physician nationwide →
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Common questions
What is William M. Kubaska, M.D.'s NPI number?
William M. Kubaska, M.D.'s National Provider Identifier (NPI) is 1548345101, issued on Oct 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William M. Kubaska, M.D. located?
The NPPES record lists a practice address at 4545 E 9TH Ave, Denver, CO, 80220. Phone: (303) 320-7340. Providers update this record themselves, so call before visiting.
How can I verify William M. Kubaska, M.D.'s license?
NPPES lists Colorado license number 35530, as entered by the provider. Search the Colorado Medical Board at https://dpo.colorado.gov/Medical. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William M. Kubaska, M.D. prescribe under Medicare Part D?
In 2024, William M. Kubaska, M.D. had 7,442 Medicare Part D claims for 501 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is William M. Kubaska, M.D.'s MIPS final score?
The 2023 MIPS final score is 14.9 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.