Quick answers
- Does Jaclyn M. Grentzer accept Medicare assignment?
- Yes. Medicare's clinician data says Jaclyn M. Grentzer 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 Jaclyn M. Grentzer's NPI number?
- 1215240338. 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 Jaclyn M. Grentzer is enrolled with Medicare (CMS data updated October 2, 2026).
- PO BoxMammoth Lakes, CA 93546
- PO Box, Suite 660Mammoth Lakes, CA 93546
Group practices
Medicare enrollment lists Jaclyn M. Grentzer as a member of this group (CMS data updated October 2, 2026).
- Southern Mono Health Care District100 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in Mammoth Lakes
Clinicians with the same Medicare primary specialty in Mammoth Lakes, CA — not a recommendation.
Other clinicians in Southern Mono Health Care District
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Washington University School Of Medicine |
| Graduation year | 2010 (16 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1215240338 |
| 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