Donald Whisler, M.D.
NPI 1639516149 · Rheumatology Physician · Santa Rosa, CA
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Donald Whisler, M.D. is a Rheumatology Physician provider in Santa Rosa, CA (NPI 1639516149).
Provider details
- NPI number
- 1639516149
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
13 yrs in NPPES registry
- Profile completeness25% of score
83% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
1,577 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 | 600 | $139 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 573 | $17 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 103 | $99 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 98 | $177 |
| Telephone Medical Discussion With Physician, 11-20 Minutes99442 | 76 | $99 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 26 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 448 | 119 |
| Hydroxychloroquine Sulfate | 367 | 122 |
| Leflunomide | 185 | 60 |
| Methotrexate Sodiumbrand: Methotrexate | 122 | 40 |
| Sulfasalazine | 100 | 36 |
| Meloxicam | 100 | 41 |
| Celecoxib | 90 | 34 |
| Adalimumab |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$145 across 8 records (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)
- 500 Doyle Park Dr Ste 300Santa Rosa, CA 95405-4559Phone: (707) 303-8344Fax: (717) 303-8345
Registry dates
- Enumerated
- 2013-05-24
- Last updated
- 2021-11-11
- Certified
- 2021-11-11
Frequently asked questions
- What is Donald Whisler's NPI number?
- Donald Whisler's National Provider Identifier (NPI) is 1639516149, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Donald Whisler's specialty?
- Donald Whisler is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Donald Whisler located?
- Donald Whisler's practice location on file with NPPES is 1162 Montgomery Dr Ste 3, Santa Rosa, CA 95405-4802.
- What is Donald Whisler's phone number?
- The practice phone number listed in the NPPES registry for Donald Whisler is (707) 890-4250.
- Does Donald Whisler accept Medicare?
- Donald Whisler is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Donald Whisler's NPI active?
- Yes — Donald Whisler's NPI (1639516149) is active in the NPPES registry as of the last update on 2021-11-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.