C. Michael Neuwelt, M.D.
NPI 1598786790 · Rheumatology Physician · San Leandro, CA
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
C. Michael Neuwelt, M.D. is a Rheumatology Physician provider in San Leandro, CA (NPI 1598786790).
Provider details
- NPI number
- 1598786790
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- G38264 (CA)
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
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,652 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 | 446 | $153 |
| Administration of Non-Hormonal Anti-Neoplastic Chemotherapy Under Skin Or Into Muscle96401 | 298 | $98 |
| 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 | 285 | $19 |
| Administration of Chemotherapy Into Vein, 1 Hour Or Less96413 | 263 | $177 |
| Telephone Medical Discussion With Physician, 11-20 Minutes99442 | 91 | $111 |
| Administration of Chemotherapy Into Vein, Each Additional Hour |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 39 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 411 | 122 |
| Hydroxychloroquine Sulfate | 298 | 92 |
| Methotrexate Sodiumbrand: Methotrexate | 172 | 58 |
| Gabapentin | 126 | 38 |
| Sulfasalazine | 86 | 31 |
| Diclofenac Sodium | 59 | 26 |
| Azathioprine | 47 | 16 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$25,965 across 66 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
Registry dates
- Enumerated
- 2006-07-22
- Last updated
- 2008-12-10
Frequently asked questions
- What is C. Michael Neuwelt's NPI number?
- C. Michael Neuwelt's National Provider Identifier (NPI) is 1598786790, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is C. Michael Neuwelt's specialty?
- C. Michael Neuwelt is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is C. Michael Neuwelt located?
- C. Michael Neuwelt's practice location on file with NPPES is 13851 E 14th St, San Leandro, CA 94578-2631.
- What is C. Michael Neuwelt's phone number?
- The practice phone number listed in the NPPES registry for C. Michael Neuwelt is (510) 357-1303.
- Does C. Michael Neuwelt accept Medicare?
- C. Michael Neuwelt is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is C. Michael Neuwelt's NPI active?
- Yes — C. Michael Neuwelt's NPI (1598786790) is active in the NPPES registry as of the last update on 2008-12-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.