Joshua Keller, M.D.
NPI 1578975439 · Rheumatology Physician · Portland, ME
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Joshua Keller, M.D. is a Rheumatology Physician provider in Portland, ME (NPI 1578975439).
Provider details
- NPI number
- 1578975439
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- MD21587 (ME)
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
12 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
3,019 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) |
|---|---|---|
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 435 | $9 |
| Blood Test, Comprehensive Group of Blood Chemicals80053 | 303 | $10 |
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 291 | $8 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 278 | $125 |
| Measurement C-Reactive Protein for Detection of Infection Or Inflammation86140 | 261 | $5 |
| Red Blood Cell Sedimentation Rate, to Detect Inflammation, Non-Automated85651 | 248 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 25 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 546 | 201 |
| Methotrexate Sodiumbrand: Methotrexate | 309 | 107 |
| Hydroxychloroquine Sulfate | 176 | 59 |
| Allopurinol | 147 | 40 |
| Alendronate Sodium | 99 | 31 |
| Methylprednisolone | 56 | 24 |
| Mycophenolate Mofetil | 47 | 16 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2014-05-27
- Last updated
- 2021-09-30
- Certified
- 2021-09-30
Frequently asked questions
- What is Joshua Keller's NPI number?
- Joshua Keller's National Provider Identifier (NPI) is 1578975439, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Joshua Keller's specialty?
- Joshua Keller is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Joshua Keller located?
- Joshua Keller's practice location on file with NPPES is 51 Sewall St, Portland, ME 04102-2643.
- What is Joshua Keller's phone number?
- The practice phone number listed in the NPPES registry for Joshua Keller is (207) 774-5761.
- Does Joshua Keller accept Medicare?
- Joshua Keller is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Joshua Keller's NPI active?
- Yes — Joshua Keller's NPI (1578975439) is active in the NPPES registry as of the last update on 2021-09-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.