Robert Master, MD
NPI 1518048131 · Internal Medicine Physician · Cambridge, MA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Robert Master, MD is a Internal Medicine Physician provider in Cambridge, MA (NPI 1518048131).
Provider details
- NPI number
- 1518048131
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 35355 (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
19 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
117 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) |
|---|---|---|
| Residence Visit for Established Patient With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 40 Minutes99349 | 38 | $130 |
| Transitional Care Management Services for Problem of at Least Moderate Complexity99495 | 32 | $217 |
| Residence Visit for Established Patient With Low Level of Medical Decision Making, Per Day, If Using Time, at Least 30 Minutes99348 | 31 | $78 |
| Residence Visit for New Patient With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 60 Minutes99344 | 16 | $142 |
Typical Medicare-allowed amounts for these services range $78–$217 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote 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 · 52 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 94 | 13 |
| Amlodipine Besylate | 79 | — |
| Levothyroxine Sodium | 74 | — |
| Gabapentin | 70 | — |
| Tamsulosin Hcl | 59 | — |
| Sertraline Hcl | 58 | — |
| Omeprazole |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-18
- Last updated
- 2024-09-17
- Certified
- 2024-09-17
Frequently asked questions
- What is Robert Master's NPI number?
- Robert Master's National Provider Identifier (NPI) is 1518048131, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Robert Master's specialty?
- Robert Master is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Robert Master located?
- Robert Master's practice location on file with NPPES is 9a Forest St, Cambridge, MA 02140-1501.
- What is Robert Master's phone number?
- The practice phone number listed in the NPPES registry for Robert Master is (617) 680-6892.
- Does Robert Master accept Medicare?
- Robert Master is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Robert Master's NPI active?
- Yes — Robert Master's NPI (1518048131) is active in the NPPES registry as of the last update on 2024-09-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.