MARK D CALAYAG M.D.
NPI 1336373901
Psychiatry & Neurology - Neurology with Special Qualifications in Child Neurology in Orange, CA
About Mark D Calayag M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARK D CALAYAG M.D. (NPI 1336373901) is an individual neurology with special qualifications in child neurology provider in Orange, California, licensed in California (A137268) and active in the NPI registry since May 2009. He is enrolled in Medicare PECOS and is a graduate of Albany Medical College Of Union University (2009).
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
Mark D Calayag 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
2Medicare enrollment records show Mark Calayag reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Orange, CA 92868
- Reassigned Medicare billing, California enrollment
- 32 clinicians in this Medicare group
Anaheim, CA 92807
- Reassigned Medicare billing, California enrollment
- Also billed through NPI 1396287082 (California)
- 13,921 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 92868 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.
ORANGE, CA 92868
ORANGE, CA 92868
ORANGE, CA 92868
ORANGE, CA 92868
ORANGE, CA 92868
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 Mark Calayag's NPI number?
The NPI number for Mark Calayag is 1336373901. It was assigned to this individual provider in the NPPES registry on May 11, 2009.
Where is Mark Calayag located?
Mark Calayag practices at 200 S Manchester Ave Suite 210, Orange, CA 92868. The listed phone number is (714) 456-6966.
What is Mark Calayag's specialty?
The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Neurology with Special Qualifications in Child Neurology, with taxonomy code 2084N0402X.
Is Mark Calayag enrolled in Medicare?
Yes. Mark Calayag 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 Mark Calayag's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Calayag reassigns Medicare benefits to 2 organizations: Regents Of The University Of California (Orange, CA) and Southern California Permanente Medical Group (Anaheim, 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 Mark Calayag'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 Mark Calayag was last updated on January 3, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 22 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.
# Mark D Calayag, M.D. · NPI 1336373901
Neurology with Special Qualifications in Child Neurology physician in Orange, California. Individual provider, active in the CMS NPPES registry since May 11, 2009.
## Identity
- **NPI:** 1336373901 (Entity type: Individual)
- **Enumerated:** May 11, 2009
- **Primary specialty:** Psychiatry & Neurology - Neurology with Special Qualifications in Child Neurology · taxonomy 2084N0402X
- **State license:** A137268 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 200 S MANCHESTER AVE, SUITE 210, Orange, CA 92868-3217
- **Phone:** (714) 456-6966
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Regents Of The University Of California (NPI 1659329746, Orange, CA); Southern California Permanente Medical Group (NPI 1952333460, Anaheim, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Albany Medical College Of Union University, class of 2009
## Record status
- **NPPES last updated:** January 3, 2025
---
Source: [NPI Profile](https://npiprofile.com/npi/1336373901) · Data from the CMS NPPES public registry.