Gregory Lines, M.D.
NPI 1053842773 · Internal Medicine Physician · Cambridge, MA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Lines, M.D. is a Internal Medicine Physician provider in Cambridge, MA (NPI 1053842773).
Provider details
- NPI number
- 1053842773
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 282252 (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
9 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
259 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 Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 117 | $84 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 46 | $185 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 33 | $123 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 22 | $127 |
| Critical Care, First 30-74 Minutes99291 | 15 | $225 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 13 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2017-03-23
- Last updated
- 2022-06-09
- Certified
- 2022-06-09
Frequently asked questions
- What is Gregory Lines's NPI number?
- Gregory Lines's National Provider Identifier (NPI) is 1053842773, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Lines's specialty?
- Gregory Lines is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Lines located?
- Gregory Lines's practice location on file with NPPES is 1493 Cambridge St, Cambridge, MA 02139-1047.
- What is Gregory Lines's phone number?
- The practice phone number listed in the NPPES registry for Gregory Lines is (617) 665-1000.
- Does Gregory Lines accept Medicare?
- Gregory Lines is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Lines's NPI active?
- Yes — Gregory Lines's NPI (1053842773) is active in the NPPES registry as of the last update on 2022-06-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.