MARY CAROLINE YAGER MD
NPI 1801059902
Hospitalist in San Diego, CA
About Mary Caroline Yager Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARY CAROLINE YAGER MD (NPI 1801059902) is an individual hospitalist provider in San Diego, California, licensed in California (A103221) and active in the NPI registry since July 2008. She is enrolled in Medicare PECOS and is a graduate of Other (2000).
NPPES Registry Identity
Specialties & Licenses 2
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
Mary Caroline Yager 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 Reassignments
5Medicare enrollment records show Mary Yager reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Diego, CA 92103
- Reassigned Medicare billing, California enrollment
- Medicare enrollment name: Regents Of The University Of California
- 1,051 clinicians in this Medicare group
San Bernardino, CA 92404
- Reassigned Medicare billing, California enrollment
- 1,216 clinicians in this Medicare group
Tucson, AZ 85741
- Reassigned Medicare billing, Arizona enrollment
- 664 clinicians in this Medicare group
Greenbrae, CA 94904
- Reassigned Medicare billing, California enrollment
- 82 clinicians in this Medicare group
Dallas, TX 75244
- Reassigned Medicare billing, Arizona enrollment
- 556 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 2
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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 92103 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.
SAN DIEGO, CA 92103
SAN DIEGO, CA 92103
SAN DIEGO, CA 92103
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 Mary Yager's NPI number?
The NPI number for Mary Yager is 1801059902. It was assigned to this individual provider in the NPPES registry on July 8, 2008.
Where is Mary Yager located?
Mary Yager practices at 200 W Arbor Dr, San Diego, CA 92103. The listed phone number is (858) 249-6748.
What is Mary Yager's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Mary Yager enrolled in Medicare?
Yes. Mary Yager 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 Mary Yager's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mary Yager reassigns Medicare benefits to 5 organizations: Regents Of The University Of California - Ucsd Medical Group (San Diego, CA), Inpatient Specialists Of California, PC (San Bernardino, CA), Northwest Hbp Medical Services LLC (Tucson, AZ), Marin Hospitalist Medical Group, Inc. (Greenbrae, CA) and Signify Health, LLC (Dallas, TX). 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 Mary Yager'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 Mary Yager was last updated on July 21, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Mary Caroline Yager, MD · NPI 1801059902
Hospitalist physician in San Diego, California. Individual provider, active in the CMS NPPES registry since July 8, 2008.
## Identity
- **NPI:** 1801059902 (Entity type: Individual)
- **Enumerated:** July 8, 2008
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **State license:** A103221 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 200 W ARBOR DR, San Diego, CA 92103-9000
- **Phone:** (858) 249-6748
## 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:** 5 organizations under Medicare reassignment (form CMS-855R): Regents Of The University Of California - Ucsd Medical Group (NPI 1336267137, San Diego, CA); Inpatient Specialists Of California, PC (NPI 1952792475, San Bernardino, CA); Northwest Hbp Medical Services LLC (NPI 1407353006, Tucson, AZ); Marin Hospitalist Medical Group, Inc. (NPI 1023041753, Greenbrae, CA); Signify Health, LLC (NPI 1689158487, Dallas, TX) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2000
## Record status
- **NPPES last updated:** July 21, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1801059902) · Data from the CMS NPPES public registry.