Mary Guillermine Payawal Pascasio, MD
Adult Medicine Physician · Thousand Oaks, CA
Mary Guillermine Payawal Pascasio, MD is an adult medicine physician with a practice address in Thousand Oaks, California, and NPI 1508037300, issued on Mar 19, 2008. Check the license (California A113048, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Mary Guillermine Payawal Pascasio
- Credential
- MD
- Primary taxonomy
- Adult Medicine Physician 207QA0505X
- License number
- A113048 CA
Self-reported in NPPES; status is on the state search - Practice location
- 365 E Hillcrest Dr, Thousand Oaks, CA 91360
- Phone
- (888) 515-3500
- Enumerated
- Mar 19, 2008
- Record last updated
- Dec 14, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (888) 515-3500
- Medicare enrollment
- Enrolled (PECOS I20110209000135); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest adult medicine physician records → All 386 in California → Look up another NPI →
Also registered at 365 E Hillcrest Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Annapoorani Chellappan, M.D.Family Medicine Physician1023377330
- Maria Felicitas Dizon, M.D.Geriatric Medicine (Family Medicine) Physician1598910267
- Jinous Etemadi, M.D.Internal Medicine Physician1821431784
- Rouxann Fujimoto, PHARM.D.Pharmacist1750439816
- Sharon Jafari, NPNurse Practitioner1245438910
- Bernard Klein, M.D.Internal Medicine Physician1831382738
Verify Mary Guillermine Payawal Pascasio in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A113048Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4% more Medicare Part D claims than the average adult medicine physician in 2024
3,116 Medicare Part D claims for 158 beneficiaries, against an average of 3,002 among the 1,307 providers of this specialty who prescribed in Part D. 89 claims were for opioids.
Most prescribed
- Atorvastatin Calcium186 claims
- Metoprolol Tartrate88 claims
- Levothyroxine Sodium85 claims
- Amlodipine Besylate84 claims
- Furosemide81 claims
- Trazodone Hcl76 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 GroupPanorama City, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mary Guillermine Payawal Pascasio among 386 adult medicine physician records in California
Mary Guillermine Payawal Pascasio, MD is one of 386 adult medicine physician records with a practice address in California. 69% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 51% of them.
- NPI issued2008 · 51% of these records are older, 45% newer
- In a Medicare fileYes · 69% of these records are
- In the CMS Doctors and Clinicians fileYes · 48% of these records are
- Graduated2003 · median 2005 among the 187 with a school on file
- Record last updated2021 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207QA0505X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Adult Medicine Physician providers in California
There are 386 adult medicine physician records in California.
All 386 in California → Every provider in Thousand Oaks → Adult Medicine Physician nationwide →
The 8 adult medicine physician records with the nearest ZIP codes
- Munira Husain, M.D.Thousand Oaks, CA 913601184856460
- Michele Ghaussy, M.D.Thousand Oaks, CA 913611962402180
- Alina Katsman, M.D.Westlake Village, CA 913611528351459
- Candice Lane, M.D.Westlake Village, CA 913611356547483
- Sofia Vaisman, M.D.Woodland Hills, CA 913641497846638
- Brandi MedinaWoodland Hills, CA 913671295360782
- Ashton Garbutt, MDMission Hills, CA 913451407350622
- Ladan Hassanzadeh-KhayyatMission Hills, CA 913451831830868
Common questions
What is Mary Guillermine Payawal Pascasio, MD's NPI number?
Mary Guillermine Payawal Pascasio, MD's National Provider Identifier (NPI) is 1508037300, issued on Mar 19, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Mary Guillermine Payawal Pascasio, MD located?
The NPPES record lists a practice address at 365 E Hillcrest Dr, Thousand Oaks, CA, 91360. Phone: (888) 515-3500. Providers update this record themselves, so call before visiting.
How can I verify Mary Guillermine Payawal Pascasio, MD's license?
NPPES lists California license number A113048, 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 Mary Guillermine Payawal Pascasio, MD prescribe under Medicare Part D?
In 2024, Mary Guillermine Payawal Pascasio, MD had 3,116 Medicare Part D claims for 158 beneficiaries; the average among adult medicine physician prescribers was 3,002. 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.