DR. MELISSA LOUISE ENNEN M.D.
NPI 1316134885
Anesthesiology in Walnut Creek, CA
About Dr. Melissa Louise Ennen M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MELISSA LOUISE ENNEN M.D. (NPI 1316134885) is an individual anesthesiology provider in Walnut Creek, California, licensed in California (A95735) and active in the NPI registry since September 2007. She is enrolled in Medicare PECOS, maintains a secondary practice location in Walnut Creek, and is a graduate of Perelman School Of Med At The University Of Pennsylvania (2003).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Melissa Louise Ennen M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
3Medicare enrollment records show Melissa Ennen reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Walnut Creek, CA 94598
- Reassigned Medicare billing, California enrollment
- 810 clinicians in this Medicare group
Walnut Creek, CA 94598
- Reassigned Medicare billing, California enrollment
- 833 clinicians in this Medicare group
San Ramon, CA 94583
- Reassigned Medicare billing, California enrollment
- 27 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 5
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
WALNUT CREEK, CA 94598
WALNUT CREEK, CA 94598
WALNUT CREEK, CA 94598
WALNUT CREEK, CA 94598
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Melissa Ennen's NPI number?
The NPI number for Melissa Ennen is 1316134885. It was assigned to this individual provider in the NPPES registry on September 28, 2007.
Where is Melissa Ennen located?
Melissa Ennen practices at 2637 Shadelands Dr, Walnut Creek, CA 94598. The listed phone number is (925) 932-6330.
What is Melissa Ennen's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Melissa Ennen enrolled in Medicare?
Yes. Melissa Ennen is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Melissa Ennen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Melissa Ennen reassigns Medicare benefits to 3 organizations: John Muir Trauma Physicians Billing Service (Walnut Creek, CA), Cep America - Anesthesia, PC (Walnut Creek, CA) and Pontine Incorporated (San Ramon, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Melissa Ennen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Melissa Ennen was last updated on June 21, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Melissa Louise Ennen, M.D. · NPI 1316134885
Anesthesiology physician in Walnut Creek, California. Individual provider, active in the CMS NPPES registry since September 28, 2007.
## Identity
- **NPI:** 1316134885 (Entity type: Individual)
- **Enumerated:** September 28, 2007
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** A95735 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 2637 SHADELANDS DR, Walnut Creek, CA 94598-2512
- **Phone:** (925) 932-6330 · **Fax:** (925) 932-0139
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): John Muir Trauma Physicians Billing Service (NPI 1962551861, Walnut Creek, CA); Cep America - Anesthesia, PC (NPI 1790401438, Walnut Creek, CA); Pontine Incorporated (NPI 1053757609, San Ramon, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Perelman School Of Med At The University Of Pennsylvania, class of 2003
## Record status
- **NPPES last updated:** June 21, 2018
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Source: [NPI Profile](https://npiprofile.com/npi/1316134885) · Data from the CMS NPPES public registry.