Janet Lo, MD
NPI 1639290083 · Endocrinology, Diabetes & Metabolism Physician · Boston, MA
Enrolled with Medicare as Practitioner - Endocrinology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Janet Lo, MD is a Endocrinology, Diabetes & Metabolism Physician provider in Boston, MA (NPI 1639290083).
Provider details
- NPI number
- 1639290083
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- L-221992 (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
93 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 High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 68 | $193 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 25 | $138 |
Typical Medicare-allowed amounts for these services range $138–$193 (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 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Evolocumabbrand: Repatha Sureclick | 133 | 30 |
| Ezetimibe | 49 | 15 |
| Levothyroxine Sodium | 49 | 15 |
| Alirocumabbrand: Praluent Pen | 47 | 16 |
| Rosuvastatin Calcium | 37 | — |
| Atorvastatin Calcium | 26 | — |
| Testosterone | 25 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-04-03
- Last updated
- 2012-11-09
Frequently asked questions
- What is Janet Lo's NPI number?
- Janet Lo's National Provider Identifier (NPI) is 1639290083, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Janet Lo's specialty?
- Janet Lo is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is Janet Lo located?
- Janet Lo's practice location on file with NPPES is Massachusetts General Hospital, Boston, MA 02114.
- What is Janet Lo's phone number?
- The practice phone number listed in the NPPES registry for Janet Lo is (617) 724-9109.
- Does Janet Lo accept Medicare?
- Janet Lo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Janet Lo's NPI active?
- Yes — Janet Lo's NPI (1639290083) is active in the NPPES registry as of the last update on 2012-11-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.