Mark Calayag, M.D.
NPI 1336373901 · Neurology with Special Qualifications in Child Neurology Physician · Orange, CA
Enrolled with Medicare as Practitioner - Neurosurgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Calayag, M.D. is a Neurology with Special Qualifications in Child Neurology Physician provider in Orange, CA (NPI 1336373901).
Provider details
- NPI number
- 1336373901
- Entity type
- Individual
- Primary specialty
- Neurology with Special Qualifications in Child Neurology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 137268 (CA)
Specialties & taxonomies
- Neurology with Special Qualifications in Child Neurology PhysicianPrimary2084N0402XLicense A137268 (CA)
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
17 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2009-05-11
- Last updated
- 2025-01-03
- Certified
- 2025-01-03
Frequently asked questions
- What is Mark Calayag's NPI number?
- Mark Calayag's National Provider Identifier (NPI) is 1336373901, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Calayag's specialty?
- Mark Calayag is listed in the NPPES registry with a primary specialty of Neurology with Special Qualifications in Child Neurology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Calayag located?
- Mark Calayag's practice location on file with NPPES is 200 S Manchester Ave, Orange, CA 92868-3217.
- What is Mark Calayag's phone number?
- The practice phone number listed in the NPPES registry for Mark Calayag is (714) 456-6966.
- Does Mark Calayag accept Medicare?
- Mark Calayag is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Calayag's NPI active?
- Yes — Mark Calayag's NPI (1336373901) is active in the NPPES registry as of the last update on 2025-01-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.