MR. MARTIN SANTIAGO CORTEZ LCSW
NPI 1891139002
Social Worker - Clinical in San Mateo, CA
About Mr. Martin Santiago Cortez Lcsw NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MR. MARTIN SANTIAGO CORTEZ LCSW (NPI 1891139002) is an individual clinical provider in San Mateo, California, licensed in California (28599) and active in the NPI registry since April 2013. He is enrolled in Medicare PECOS and is a graduate of Other (2003).
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
Mr. Martin Santiago Cortez Lcsw 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 Martin Cortez reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
San Mateo, CA 94403
- Reassigned Medicare billing, California enrollment
- 597 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 94403 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 MATEO, CA 94403
SAN MATEO, CA 94403
SAN MATEO, CA 94403
SAN MATEO, CA 94403
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 Martin Cortez's NPI number?
The NPI number for Martin Cortez is 1891139002. It was assigned to this individual provider in the NPPES registry on April 18, 2013.
Where is Martin Cortez located?
Martin Cortez practices at 225 37th Ave 3rd Floor, San Mateo, CA 94403. The listed phone number is (650) 799-6548.
What is Martin Cortez's specialty?
The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.
Is Martin Cortez enrolled in Medicare?
Yes. Martin Cortez 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 Martin Cortez's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Martin Cortez reassigns Medicare benefits to County Of San Mateo (San Mateo, 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 Martin Cortez'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 Martin Cortez was last updated on April 18, 2013. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.
# Mr. Martin Santiago Cortez, LCSW · NPI 1891139002
Clinical provider in San Mateo, California. Individual provider, active in the CMS NPPES registry since April 18, 2013.
## Identity
- **NPI:** 1891139002 (Entity type: Individual)
- **Enumerated:** April 18, 2013
- **Primary specialty:** Social Worker - Clinical · taxonomy 1041C0700X
- **State license:** 28599 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 225 37TH AVE, 3RD FLOOR, San Mateo, CA 94403-4324
- **Phone:** (650) 799-6548
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment
- **Bills Medicare through:** County Of San Mateo (NPI 1114005105, San Mateo, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2003
## Record status
- **NPPES last updated:** April 18, 2013
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Source: [NPI Profile](https://npiprofile.com/npi/1891139002) · Data from the CMS NPPES public registry.