CELINA ALLYN MERCER MD
NPI 1245850585
Family Medicine in Petaluma, CA
About Celina Allyn Mercer Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
CELINA ALLYN MERCER MD (NPI 1245850585) is an individual family medicine provider in Petaluma, California, licensed in California (A183797) and active in the NPI registry since April 2020. She is enrolled in Medicare PECOS and is a graduate of Tulane University School Of Medicine (2020).
NPPES Registry Identity
Specialties & Licenses
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
Celina Allyn Mercer Md 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 Reassignment
Medicare enrollment records show Celina Mercer reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Petaluma, CA 94954
- Reassigned Medicare billing, California enrollment
- 63 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94954 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
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 Celina Mercer's NPI number?
The NPI number for Celina Mercer is 1245850585. It was assigned to this individual provider in the NPPES registry on April 16, 2020.
Where is Celina Mercer located?
Celina Mercer practices at 1179 N Mcdowell Blvd, Petaluma, CA 94954. The listed phone number is (707) 559-7500.
What is Celina Mercer's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Celina Mercer enrolled in Medicare?
Yes. Celina Mercer 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 organization bills Medicare for Celina Mercer's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Celina Mercer reassigns Medicare benefits to Petaluma Health Center Inc (Petaluma, CA). The 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 Celina Mercer'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 Celina Mercer was last updated on February 7, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 21 months 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.
# Celina Allyn Mercer, MD · NPI 1245850585
Family Medicine physician in Petaluma, California. Individual provider, active in the CMS NPPES registry since April 16, 2020.
## Identity
- **NPI:** 1245850585 (Entity type: Individual)
- **Enumerated:** April 16, 2020
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** A183797 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1179 N MCDOWELL BLVD, Petaluma, CA 94954-6559
- **Phone:** (707) 559-7500
## 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:** Petaluma Health Center Inc (NPI 1588656268, Petaluma, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Tulane University School Of Medicine, class of 2020
## Record status
- **NPPES last updated:** February 7, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1245850585) · Data from the CMS NPPES public registry.