Quick answers
- Does Melissa L. Ennen accept Medicare assignment?
- Yes. Medicare's clinician data says Melissa L. Ennen 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.
- How many Medicare patients does Melissa L. Ennen see?
- In 2024, CMS data shows 143 Original Medicare patients and 223 services for Melissa L. Ennen. This counts Original Medicare only and measures volume, not quality.
- What is Melissa L. Ennen's NPI number?
- 1316134885. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Melissa L. Ennen, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 143 |
|---|---|
| Services billed to Medicare | 223 |
| Different services or procedures | 22 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Injection of anesthetic agent and/or steroid into arm nerve bundle (brachial plexus) (64415)51 services
- Anesthesia for procedure on nerves, muscles, tendons, and tissue of forearm, wrist, and hand (01810)45 services
- Anesthesia for other procedure on top of arm bone and shoulder joint (01630)32 services
- Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve) (64447)17 services
- Anesthesia for procedure for total knee joint replacement (01402)13 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol75%
- Arthritis66%
- High blood pressure64%
- Osteoporosis25%
- Anxiety20%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)20%
Practice locations
Addresses where Melissa L. Ennen is enrolled with Medicare (CMS data updated October 2, 2026).
- 100 Park Pl, Suite 110San Ramon, CA 94583 (925) 413‑0407
- 2000 Mowry AveFremont, CA 94538 (510) 797‑1111
- 2405 Shadelands Dr, Suite 200Walnut Creek, CA 94598 (925) 935‑6700
- 460 N Wiget Ln, Suite AWalnut Creek, CA 94598 (925) 378‑4949
Group practices
Medicare enrollment lists Melissa L. Ennen as a member of this group (CMS data updated October 2, 2026).
- Cep America - Anesthesia PC849 clinicians in the group
Specialties
- Anesthesiologyprimary
Other anesthesiologists in San Ramon
Clinicians with the same Medicare primary specialty in San Ramon, CA — not a recommendation.
Other clinicians in Cep America - Anesthesia PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Perelman School Of Med At The University Of Pennsylvania |
| Graduation year | 2003 (23 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1316134885 |
| 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
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- 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