COUNTY OF SAN MATEO
NPI 1144309055
Psychiatric Unit in San Mateo, CA

Active since November 02, 2006
222 W 39TH AVE, SAN MATEO, CA 94403(650) 573-2222 Get Directions Write a Review

NPPES record last updated: October 16, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About County Of San Mateo NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

COUNTY OF SAN MATEO (NPI 1144309055), doing business as San Mateo Medical Center, is a healthcare organization registered as a psychiatric unit in San Mateo, California and active in the NPI registry since November 2006. The organization lists Jennifer Papa, Chief Financial Officer, as its authorized official.

NPPES Registry Identity

NPI1144309055
Entity TypeOrganization
Primary Taxonomy273R00000X
Legal Business NameCOUNTY OF SAN MATEO
Location Address222 W 39TH AVESan Mateo, CA 94403-4364
Mailing Address222 W 39th AveSan Mateo, CA 94403-4364 · (650) 573-2222
Organization SubpartYes
Authorized OfficialJennifer PapaChief Financial Officer · (650) 573-2613
Enumeration DateNovember 2, 2006
Last NPPES UpdateOctober 16, 2025
NPPES CertifiedOctober 16, 2025
✔ NPI 1144309055 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatric UnitHospital Units
Taxonomy Code273R00000X
Definition
In general, a distinct unit of a hospital that provides acute or long-term care to emotionally disturbed patients, including patients admitted for diagnosis and those admitted for treatment of psychiatric problems on the basis of physicians' orders and approved nursing care plans. Long-term care may include intensive supervision to the chronically mentally ill, mentally disordered or other mentally incompetent persons; (2) For Medicare, a distinct part of a general acute care hospital admitting only patients whose admission to the unit is required for active treatment, whose treatment is of an intensity that can be provided only in an inpatient hospital setting, and whose condition is described by a psychiatric principal diagnosis contained in the Third Edition of the American Psychiatric Association Diagnostic and Statistical Manual or in Chapter 5 (Mental Disorders) of the International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM). The unit must furnish, through the use of qualified personnel, psychological services, social work services, psychiatric nursing, occupational therapy, and recreational therapy. The unit must maintain medical records that permit determination of the degree and intensity of treatment provided to individuals who are furnished services in the unit; the unit must meet special staff requirements in that the unit must have adequate numbers of qualified professional and supportive staff to evaluate inpatients, formulate written, individualized, comprehensive treatment plans, provide active treatment measures and engage in discharge planning.
222 W 39TH AVE, San Mateo, CA 94403

Other Names 1

Doing Business AsSan Mateo Medical Center

Other Identifiers 1

MedicaidGR0028886CA

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

County Of San Mateo is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

593

Medicare enrollment records show 593 clinicians reassign Medicare billing to County Of San Mateo, which bills Medicare for the services they deliver. Of these, 60 practice at this address and 276 within 10 miles. Listed here are the 20 practicing nearest to this location.

Clinicians by Medicare Specialty 52

Psychiatry89
Nurse Practitioner82
Internal Medicine59
Marriage and Family Therapist42
Diagnostic Radiology29
Clinical Social Worker25
Anesthesiology24
Family Practice22
44 other specialties221

Nearest to this location (20)

See all 593
Clinical Psychologist
NPI 1811398373
225 37TH AVE FL 3
San Mateo, CA 94403
(650) 888-4834
✔ PECOS✔ Accepts MedicareSame address
Pediatric Medicine
NPI 1033402847
222 W 39TH AVE
San Mateo, CA 94403
(650) 573-2222
✔ PECOSSame address
Cardiovascular Disease (Cardiology)
NPI 1780997064
222 W 39TH AVE
San Mateo, CA 94403
(650) 573-2681
✔ PECOS✔ Accepts MedicareSame address
Cardiovascular Disease (Cardiology)
NPI 1144254806
222 W 39TH AVE
San Mateo, CA 94403
(650) 573-2384
✔ PECOS✔ Accepts MedicareSame address
Cardiac Surgery
NPI 1528080256
222 W 39TH AVE
San Mateo, CA 94403
(650) 573-2222
✔ PECOS✔ Accepts MedicareSame address
Nurse Practitioner
NPI 1578909776
222 W 39TH AVE
San Mateo, CA 94403
(650) 573-2222
✔ PECOSSame address
Psychiatry
NPI 1306465125
222 W 39TH AVE
San Mateo, CA 94403
(650) 573-2222
✔ PECOS✔ Accepts MedicareSame address
Psychiatry
NPI 1477128932
222 W 39TH AVE
San Mateo, CA 94403
(650) 573-2222
✔ PECOS✔ Accepts MedicareSame address
Clinical Social Worker
NPI 1891139002
225 37TH AVE 3RD FLOOR
San Mateo, CA 94403
(650) 799-6548
✔ PECOS✔ Accepts MedicareSame address
Hospitalist
NPI 1962700187
222 W 39TH AVE SOUND PHYSICIAN HOSPITALIST OFFICE
San Mateo, CA 94403
(650) 573-2222
✔ PECOS✔ Accepts MedicareSame address
Internal Medicine
NPI 1124187950
222 W 39TH AVE
San Mateo, CA 94403
(650) 573-2222
✔ PECOS✔ Accepts MedicareSame address
General Practice
NPI 1508960766
222 W 39TH AVE
San Mateo, CA 94403
(650) 573-2426
✔ PECOSSame address
Marriage and Family Therapist
NPI 1780870295
225 37TH AVE
San Mateo, CA 94403
(650) 573-2895
✔ PECOSSame address
Obstetrics/Gynecology
NPI 1720422561
222 W 39TH AVE DEPT OF OB GYN
San Mateo, CA 94403
(650) 573-2036
✔ PECOS✔ Accepts MedicareSame address
Infectious Disease
NPI 1053485748
222 W 39TH AVE
San Mateo, CA 94403
(650) 573-2222
✔ PECOS✔ Accepts MedicareSame address
Family Practice
NPI 1255416236
222 W 39TH AVE
San Mateo, CA 94403
(650) 573-3702
✔ PECOS✔ Accepts MedicareSame address
Gastroenterology
NPI 1447318829
222 W 39TH AVE
San Mateo, CA 94403
(650) 573-2222
✔ PECOSSame address
Hand Surgery
NPI 1154515385
222 W 39TH AVE
San Mateo, CA 94403
(650) 573-2222
✔ PECOS✔ Accepts MedicareSame address
Neurology
NPI 1770879900
222 W 39TH AVE
San Mateo, CA 94403
(650) 301-8654
✔ PECOSSame address
Rheumatology
NPI 1295815579
222 W 39TH AVE
San Mateo, CA 94403
(650) 573-2222
✔ PECOS✔ Accepts MedicareSame address
See all 593 clinicians

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

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 County Of San Mateo's NPI number?

The NPI number for County Of San Mateo is 1144309055. It was assigned to this organization in the NPPES registry on November 2, 2006. The provider is doing business as San Mateo Medical Center.

Where is County Of San Mateo located?

County Of San Mateo is located at 222 W 39th Ave, San Mateo, CA 94403. The listed phone number is (650) 573-2222.

What is County Of San Mateo's specialty?

The primary specialty registered for this NPI is Psychiatric Unit with taxonomy code 273R00000X.

Is County Of San Mateo enrolled in Medicare?

Yes. County Of San Mateo is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through County Of San Mateo?

According to the CMS Revalidation Reassignment List (October 2026 release), 593 clinicians in 52 Medicare specialties reassign their Medicare billing to County Of San Mateo. A 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 the clinician's services. The largest specialties are Psychiatry (89), Nurse Practitioner (82) and Internal Medicine (59). Of these, 60 practice at this address and 276 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for County Of San Mateo was last updated on October 16, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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.