Gregory Challener, MD
NPI 1659831865 · Rheumatology Physician · Boston, MA
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Challener, MD is a Rheumatology Physician provider in Boston, MA (NPI 1659831865).
Provider details
- NPI number
- 1659831865
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 292803 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
7 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
47 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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 | 19 | $107 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 16 | $159 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 12 | $147 |
Typical Medicare-allowed amounts for these services range $107–$159 (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 · 10 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 95 | 30 |
| Methotrexate Sodiumbrand: Methotrexate | 50 | 17 |
| Tocilizumabbrand: Actemra Actpen | 32 | — |
| Gabapentin | 21 | — |
| Allopurinol | 17 | — |
| Hydroxychloroquine Sulfate | 17 | — |
| Adalimumabbrand: Humira(cf) Pen |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$99 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 200 1st St SwRochester, MN 55905-0001Phone: (507) 284-2511
Registry dates
- Enumerated
- 2019-03-22
- Last updated
- 2022-10-18
- Certified
- 2022-10-18
Frequently asked questions
- What is Gregory Challener's NPI number?
- Gregory Challener's National Provider Identifier (NPI) is 1659831865, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Challener's specialty?
- Gregory Challener is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Challener located?
- Gregory Challener's practice location on file with NPPES is 55 Fruit St, Boston, MA 02114-2621.
- What is Gregory Challener's phone number?
- The practice phone number listed in the NPPES registry for Gregory Challener is (412) 400-3003.
- Does Gregory Challener accept Medicare?
- Gregory Challener is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Challener's NPI active?
- Yes — Gregory Challener's NPI (1659831865) is active in the NPPES registry as of the last update on 2022-10-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.