Mackenzie Howard Holmberg, MD
Internal Medicine Physician · Seattle, WA
Mackenzie Howard Holmberg, MD is an internal medicine physician with a practice address in Seattle, Washington, and NPI 1184253080, issued on Apr 3, 2020. Check the license (Washington MD61057155, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- Mackenzie Howard Holmberg
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MD61057155 WA
Self-reported in NPPES; status is on the state search - Practice location
- 4245 Roosevelt Way NE FL 3, Seattle, WA 98105
- Phone
- (206) 598-8750
- Enumerated
- Apr 3, 2020
- Record last updated
- May 29, 2024
- Medicare enrollment
- Enrolled (PECOS I20230622000913); accepts Medicare assignment
- Medical or professional school
- University Of Washington School Of Medicine, 2020
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 4245 Roosevelt Way NE FL 3
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Dara Carlson, ARNPNurse Practitioner1588067433
- Candace Haghighi, MDStudent in an Organized Health Care Education/Training Program1972362028
- Ticara Onyewuenyi, MD, MPHObstetrics & Gynecology Physician1265092381
Verify Mackenzie Howard Holmberg in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license MD61057155Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
82% fewer Medicare Part D claims than the average internal medicine physician in 2024
567 Medicare Part D claims for 91 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium35 claims
- Losartan Potassium26 claims
- Amlodipine Besylate22 claims
- Sertraline Hcl18 claims
- Eliquis15 claims
- Metformin Hcl15 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): 93.1 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).
Bills Medicare through one group practice
- The Association OF University PhysiciansSeattle, WA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
821 internal medicine physician records list a practice address in Seattle
They are 821 of the 41,956 NPPES records with a practice address in Seattle, and 3,079 internal medicine physician records in Washington.
All 821 in Seattle → All 3,079 in Washington → Every provider in Seattle →
Other internal medicine physician records in Washington
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- Ahmad Abadullah, MDUniversity Place, WA1225005721
- Rebecca AbaySeattle, WA1528565520
- Naseer Abbas, MDTacoma, WA1962769380
- James Abbey, M.D.Anacortes, WA1447646039
- Joel Abbott, D.O.Tacoma, WA1477752723
- Paul Abdallah, MDSeattle, WA1639166119
- Abir Abdel-Kader, MDRichland, WA1649407081
- Hussein Abdille, MDSeattle, WA1588368831
Common questions
What is Mackenzie Howard Holmberg, MD's NPI number?
Mackenzie Howard Holmberg, MD's National Provider Identifier (NPI) is 1184253080, issued on Apr 3, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Mackenzie Howard Holmberg, MD located?
The NPPES record lists a practice address at 4245 Roosevelt Way NE FL 3, Seattle, WA, 98105. Phone: (206) 598-8750. Providers update this record themselves, so call before visiting.
How can I verify Mackenzie Howard Holmberg, MD's license?
NPPES lists Washington license number MD61057155, as entered by the provider. Search the Washington Medical Commission at https://wahelms.my.site.com/s/license-search. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mackenzie Howard Holmberg, MD prescribe under Medicare Part D?
In 2024, Mackenzie Howard Holmberg, MD had 567 Medicare Part D claims for 91 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Mackenzie Howard Holmberg, MD's MIPS final score?
The 2023 MIPS final score is 93.1 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.