Mark Stilphen, MD
Internal Medicine Physician · San Luis Obispo, CA
Mark Stilphen, MD is an internal medicine physician with a practice address in San Luis Obispo, California, and NPI 1063630630, issued on Apr 20, 2007. Check the license (California G28153, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Mark Stilphen
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G28153 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1250 Peach St Ste B, San Luis Obispo, CA 93401
- Phone
- (805) 543-4043
- Enumerated
- Apr 20, 2007
- Record last updated
- May 14, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (805) 543-7640
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 1250 Peach St Ste B
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Chelsea Crawford, PAPhysician Assistant1679248769
- Grace Crittenden, MDInternal Medicine Physician1053343764
- Sierra Pena, MDFamily Medicine Physician1962573964
- Jennifer Poe, NPAdult Health Nurse Practitioner1073157426
- Anjeet Saini, M.D.Internal Medicine Physician1407288574
- Randall Silver, D.O.Family Medicine Physician1205827474
Verify Mark Stilphen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G28153Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Mark Stilphen among 17,696 internal medicine physician records in California
Mark Stilphen, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2007, is newer than 44% of them.
- NPI issued2007 · 44% of these records are older, 44% newer
- In a Medicare fileNo · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2019 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
41 internal medicine physician records list a practice address in San Luis Obispo
They are 41 of the 3,403 NPPES records with a practice address in San Luis Obispo, and 17,696 internal medicine physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 17,696 in California → Every provider in San Luis Obispo → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Jeffrey Bloom, MDSan Luis Obispo, CA 934011154346377
- Deborah Cherry, M.D.San Luis Obispo, CA 934011063495356
- Grace Crittenden, MDSan Luis Obispo, CA 934011053343764
- Mark Donaldson, M.D.San Luis Obispo, CA 934011710923933
- Maureen Haas, M.D.San Luis Obispo, CA 934011760437230
- Stephen Hansen, MDSan Luis Obispo, CA 934011649200742
- Jana Hanson, MDSan Luis Obispo, CA 934011508849894
- John Massaro, DOSan Luis Obispo, CA 934011588665293
Common questions
What is Mark Stilphen, MD's NPI number?
Mark Stilphen, MD's National Provider Identifier (NPI) is 1063630630, issued on Apr 20, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Mark Stilphen, MD located?
The NPPES record lists a practice address at 1250 Peach St Ste B, San Luis Obispo, CA, 93401. Phone: (805) 543-4043. Providers update this record themselves, so call before visiting.
How can I verify Mark Stilphen, MD's license?
NPPES lists California license number G28153, 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.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. 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.