Mackenzie Holmberg, MD
NPI 1184253080 · Internal Medicine Physician · Seattle, WA
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mackenzie Holmberg, MD is a Internal Medicine Physician provider in Seattle, WA (NPI 1184253080).
Provider details
- NPI number
- 1184253080
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- MD61057155 (WA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
6 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
247 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 69 | $68 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 54 | $100 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 46 | $83 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 43 | $17 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 35 | $143 |
Typical Medicare-allowed amounts for these services range $17–$143 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 14 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 35 | 20 |
| Losartan Potassium | 26 | 13 |
| Amlodipine Besylate | 22 | — |
| Sertraline Hcl | 18 | — |
| Apixabanbrand: Eliquis | 15 | — |
| Metformin Hcl | 15 | — |
| Metoprolol Succinate |
Practice location
Mailing address
Additional practice locations (2)
- 325 9th AveSeattle, WA 98104-2420Phone: (206) 520-5000
- 1959 Ne Pacific StSeattle, WA 98195-0001Phone: (206) 543-3065
Registry dates
- Enumerated
- 2020-04-03
- Last updated
- 2024-05-29
- Certified
- 2024-05-29
Frequently asked questions
- What is Mackenzie Holmberg's NPI number?
- Mackenzie Holmberg's National Provider Identifier (NPI) is 1184253080, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mackenzie Holmberg's specialty?
- Mackenzie Holmberg is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mackenzie Holmberg located?
- Mackenzie Holmberg's practice location on file with NPPES is 4245 Roosevelt Way Ne Fl 3, Seattle, WA 98105-6008.
- What is Mackenzie Holmberg's phone number?
- The practice phone number listed in the NPPES registry for Mackenzie Holmberg is (206) 598-8750.
- Does Mackenzie Holmberg accept Medicare?
- Mackenzie Holmberg is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mackenzie Holmberg's NPI active?
- Yes — Mackenzie Holmberg's NPI (1184253080) is active in the NPPES registry as of the last update on 2024-05-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.