Quick answers
- Does Leo G. Maffey accept Medicare assignment?
- Yes. Medicare's clinician data says Leo G. Maffey accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- What is Leo G. Maffey's NPI number?
- 1336342450. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Leo G. Maffey is enrolled with Medicare (CMS data updated October 2, 2026).
- 12100 Euclid StGarden Grove, CA 92840 (888) 988‑2800
- 3430 E La Palma AveAnaheim, CA 92806 (888) 988‑2800
- 3460 E La Palma AveAnaheim, CA 92806 (714) 644‑2010
- 5475 E La Palma AveAnaheim, CA 92807 (714) 279‑6088
Group practices
Medicare enrollment lists Leo G. Maffey as a member of this group (CMS data updated October 2, 2026).
- Southern California Permanente Medical Group11,293 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Garden Grove
Clinicians with the same Medicare primary specialty in Garden Grove, CA — not a recommendation.
Other clinicians in Southern California Permanente Medical Group
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, Geffen School Of Medicine |
| Graduation year | 2004 (22 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1336342450 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians