Mark D. Calayag, M.D.
Neurology with Special Qualifications in Child Neurology Physician · Orange, CA
Mark D. Calayag, M.D. is a neurology with special qualifications in child neurology physician with a practice address in Orange, California, and NPI 1336373901, issued on May 11, 2009. Check the license (California A137268, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Mark D. Calayag
- Credential
- M.D.
- Primary taxonomy
- Neurology with Special Qualifications in Child Neurology Physician 2084N0402X
- License numbers
- A137268 CA
137268 CA
Self-reported in NPPES; status is on the state search - Practice location
- 200 S Manchester Ave, Orange, CA 92868
- Phone
- (714) 456-6966
- Enumerated
- May 11, 2009
- Record last updated
- Jan 3, 2025
- Entity
- Type 1 · individual
8 nearest neurology with special qualifications in child neurology physician records → All 271 in California → Look up another NPI →
Also registered at 200 S Manchester Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mark D. Calayag in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A137268Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
95% fewer Medicare Part D claims than the average neurology with special qualifications in child neurology physician in 2024
14 Medicare Part D claims, against an average of 278 among the 900 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Mark D. Calayag among 271 neurology with special qualifications in child neurology physician records in California
Mark D. Calayag, M.D. is one of 271 neurology with special qualifications in child neurology physician records with a practice address in California. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 48% of them.
- NPI issued2009 · 48% of these records are older, 48% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileNo · 33% of these records are
- Record last updated2025 · 45% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084N0402X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Neurology with Special Qualifications in Child Neurology Physician providers in California
There are 271 neurology with special qualifications in child neurology physician records in California.
All 271 in California → Every provider in Orange → Neurology with Special Qualifications in Child Neurology Physician nationwide →
The 8 neurology with special qualifications in child neurology physician records with the nearest ZIP codes
- Jane Donat, M.D.Orange, CA 928681497723498
- Joseph Donnelly, MDOrange, CA 928681699719237
- Amanda Fernandez, M.D.Orange, CA 928681770551350
- Glenn Fowler, MDOrange, CA 928681104848274
- Sailaja Golla, MDOrange, CA 928681033309836
- Virginia Liu, M.D, PH.DOrange, CA 928681447639182
- Andrew McIntosh, MDOrange, CA 928681043233026
- Jonathan Megerian, M.D., PH.D.Orange, CA 928681124065891
Common questions
What is Mark D. Calayag, M.D.'s NPI number?
Mark D. Calayag, M.D.'s National Provider Identifier (NPI) is 1336373901, issued on May 11, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Mark D. Calayag, M.D. located?
The NPPES record lists a practice address at 200 S Manchester Ave, Orange, CA, 92868. Phone: (714) 456-6966. Providers update this record themselves, so call before visiting.
How can I verify Mark D. Calayag, M.D.'s license?
NPPES lists California license number A137268, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark D. Calayag, M.D. prescribe under Medicare Part D?
In 2024, Mark D. Calayag, M.D. had 14 Medicare Part D claims; the average among neurology with special qualifications in child neurology physician prescribers was 278. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.