Mark Ostrem, MD
NPI 1811985633 · Geriatric Medicine (Internal Medicine) Physician · Quincy, MA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Ostrem, MD is a Geriatric Medicine (Internal Medicine) Physician provider in Quincy, MA (NPI 1811985633).
Provider details
- NPI number
- 1811985633
- Entity type
- Individual
- Primary specialty
- Geriatric Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 44501 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
2,002 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) |
|---|---|---|
| Subsequent Nursing Facility Care With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 30 Minutes99309 | 799 | $111 |
| Subsequent Nursing Facility Care With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 30 Minutes99309 | 583 | $112 |
| Subsequent Nursing Facility Care With Straightforward Level of Medical Decision Making, Per Day, If Using Time, 20 Minutes Or More99308 | 185 | $78 |
| Subsequent Nursing Facility Care With Straightforward Level of Medical Decision Making, Per Day, If Using Time, 20 Minutes Or More99308 | 152 | $77 |
| Initial Nursing Facility Care With High Level of Medical Decision Making, Per Day, If Using Time, 50 Minutes Or More99306 | 73 | $191 |
| Advance Care Planning, First 30 Minutes |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 224 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Trazodone Hcl | 793 | 73 |
| Atorvastatin Calcium | 716 | 85 |
| Apixabanbrand: Eliquis | 514 | 36 |
| Gabapentin | 495 | 56 |
| Baclofen | 435 | 42 |
| Furosemide | 428 | 35 |
| Metformin Hcl | 373 | 34 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-10-06
- Last updated
- 2018-01-15
Frequently asked questions
- What is Mark Ostrem's NPI number?
- Mark Ostrem's National Provider Identifier (NPI) is 1811985633, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Ostrem's specialty?
- Mark Ostrem is listed in the NPPES registry with a primary specialty of Geriatric Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Ostrem located?
- Mark Ostrem's practice location on file with NPPES is 54 Miller St, Quincy, MA 02169-4725.
- What is Mark Ostrem's phone number?
- The practice phone number listed in the NPPES registry for Mark Ostrem is (617) 481-3300.
- Does Mark Ostrem accept Medicare?
- Mark Ostrem is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Ostrem's NPI active?
- Yes — Mark Ostrem's NPI (1811985633) is active in the NPPES registry as of the last update on 2018-01-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.