Mark Khrystian Ilagan, D.O.
Family Medicine Physician · San Bernardino, CA
Mark Khrystian Ilagan, D.O. is a family medicine physician with a practice address in San Bernardino, California, and NPI 1710326749, issued on Jun 24, 2013. Check the license (California 20A14538, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Mark Khrystian Ilagan
- Credential
- D.O.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 20A14538 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1717 E Date PL, San Bernardino, CA 92404
- Phone
- (888) 750-0036
- Enumerated
- Jun 24, 2013
- Record last updated
- Dec 1, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20160908002985); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 1717 E Date PL
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Julius Daniels, MDFamily Medicine Physician1386221661
- Carlene FueryPharmacist1639619562
- Suzy Hackworth, PHARM.D.Pharmacist1316487010
- Lusiana Kartawidjaja, M.D.Family Medicine Physician1952536625
- Mia Montoya, MDStudent in an Organized Health Care Education/Training Program1912534413
- Bolanle Oyeyipo-Ajumobi, MDFamily Medicine Physician1821084054
Verify Mark Khrystian Ilagan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A14538Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
35% more Medicare Part D claims than the average family medicine physician in 2024
4,784 Medicare Part D claims for 752 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 251 claims were for opioids.
Most prescribed
- Atorvastatin Calcium319 claims
- Amlodipine Besylate220 claims
- Losartan Potassium174 claims
- Rosuvastatin Calcium153 claims
- Lisinopril152 claims
- Levothyroxine Sodium136 claims
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.
Bills Medicare through one group practice
- Southern California Permanente Medical GroupSan Bernardino, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark Khrystian Ilagan among 17,133 family medicine physician records in California
Mark Khrystian Ilagan, D.O. is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 68% of them.
- NPI issued2013 · 68% of these records are older, 29% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2013 · median 2005 among the 10,652 with a school on file
- Record last updated2021 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
76 family medicine physician records list a practice address in San Bernardino
They are 76 of the 5,645 NPPES records with a practice address in San Bernardino, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in San Bernardino → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Nesib Ali, MDSan Bernardino, CA 924041497725261
- Rolando Cadiz, M.D.San Bernardino, CA 924041427084185
- Ann-Renee Desrochers, MDSan Bernardino, CA 924041932135076
- Luisito Francisco, MDSan Bernardino, CA 924041205806775
- Mariclem Lao, MDSan Bernardino, CA 924041487624169
- Faith Lee-Jackson, MDSan Bernandino, CA 924041699745471
- Son Nguyen, M.D.San Bernardino, CA 924041376593889
- Bolanle Oyeyipo-Ajumobi, MDSan Bernardino, CA 924041821084054
Common questions
What is Mark Khrystian Ilagan, D.O.'s NPI number?
Mark Khrystian Ilagan, D.O.'s National Provider Identifier (NPI) is 1710326749, issued on Jun 24, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Mark Khrystian Ilagan, D.O. located?
The NPPES record lists a practice address at 1717 E Date PL, San Bernardino, CA, 92404. Phone: (888) 750-0036. Providers update this record themselves, so call before visiting.
How can I verify Mark Khrystian Ilagan, D.O.'s license?
NPPES lists California license number 20A14538, 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 Khrystian Ilagan, D.O. prescribe under Medicare Part D?
In 2024, Mark Khrystian Ilagan, D.O. had 4,784 Medicare Part D claims for 752 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.