Gretchen Gignac, MD
NPI 1821288960 · Medical Oncology Physician · Boston, MA
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gretchen Gignac, MD is a Medical Oncology Physician provider in Boston, MA (NPI 1821288960).
Provider details
- NPI number
- 1821288960
- Entity type
- Individual
- Primary specialty
- Medical Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 232079 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
18 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
360 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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 120 | $102 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 93 | $150 |
| Prolonged Office Or Other Outpatient Evaluation and Management Service(s) Beyond the Maximum Required Time of the Primary Procedure Which Has Been Selected Using Total Time on the Date of the Primary Service; Each Additional 15 Minutes By the Physician OrG2212 | 55 | $33 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 39 | $124 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 29 | $69 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 10 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Relugolixbrand: Orgovyx | 294 | 53 |
| Darolutamidebrand: Nubeqa | 94 | 23 |
| Prednisone | 60 | 14 |
| Abiraterone Acetate | 57 | 13 |
| Bicalutamide | 53 | 14 |
| Enzalutamidebrand: Xtandi | 32 | — |
| Apalutamidebrand: Erleada | 23 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-07-25
- Last updated
- 2014-06-05
Frequently asked questions
- What is Gretchen Gignac's NPI number?
- Gretchen Gignac's National Provider Identifier (NPI) is 1821288960, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gretchen Gignac's specialty?
- Gretchen Gignac is listed in the NPPES registry with a primary specialty of Medical Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Gretchen Gignac located?
- Gretchen Gignac's practice location on file with NPPES is 830 Harrison Avenue, Boston, MA 02118-2905.
- What is Gretchen Gignac's phone number?
- The practice phone number listed in the NPPES registry for Gretchen Gignac is (617) 638-6428.
- Does Gretchen Gignac accept Medicare?
- Gretchen Gignac is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gretchen Gignac's NPI active?
- Yes — Gretchen Gignac's NPI (1821288960) is active in the NPPES registry as of the last update on 2014-06-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.