Pei Casas, M.D.
Family Medicine Physician · Walnut Creek, CA
Pei Casas, M.D. is a family medicine physician with a practice address in Walnut Creek, California, and NPI 1922234236, issued on Jun 2, 2009. Check the license (California A107610, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Pei Casas
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A107610 CA
Self-reported in NPPES; status is on the state search - Practice location
- 320 Lennon LN, Walnut Creek, CA 94598
- Phone
- (925) 906-2327
- Enumerated
- Jun 2, 2009
- Record last updated
- Feb 11, 2022
- Fax
- (925) 906-2327
- Medicare enrollment
- Enrolled (PECOS I20110111000734); accepts Medicare assignment
- Medical or professional school
- University Of Southern California Keck School Of Medicine, 2007
- 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 320 Lennon LN
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Vitas Alekna, MDOphthalmology Physician1770661860
- Mary Andre, P.T.Physical Therapist1740344779
- Lynn Arsenault, MDPediatrics Physician1972681054
- Ashley Batchelder, DPTPhysical Therapist1851450936
- Cynthia Bellitt, R.N.N.P.Women's Health Nurse Practitioner1851464630
Verify Pei Casas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A107610Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
42% more Medicare Part D claims than the average family medicine physician in 2024
5,035 Medicare Part D claims for 590 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. 277 claims were for opioids.
Most prescribed
- Atorvastatin Calcium518 claims
- Lisinopril230 claims
- Levothyroxine Sodium214 claims
- Amlodipine Besylate192 claims
- Losartan Potassium169 claims
- Atenolol145 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
- Permanente Medical Group IncRichmond, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Pei Casas among 17,133 family medicine physician records in California
Pei Casas, M.D. 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 2009, is newer than 58% of them.
- NPI issued2009 · 58% of these records are older, 40% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2007 · median 2005 among the 10,652 with a school on file
- Record last updated2022 · 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).
116 family medicine physician records list a practice address in Walnut Creek
They are 116 of the 6,170 NPPES records with a practice address in Walnut Creek, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Walnut Creek → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Taejoon Ahn, M.D.Walnut Creek, CA 945981639198757
- Leatrice Chang, MDWalnut Creek, CA 945981700822053
- John Crockett, M.D.Walnut Creek, CA 945981134221021
- Dennis Fong, M.D.Walnut Creek, CA 945981356364871
- Paul Kim, M.D.Walnut Creek, CA 945981609831163
- Pavani Kuruma, MDWalnut Creek, CA 945981285601310
- Franklin Long, MD MPHTMWalnut Creek, CA 945981194744045
- Timmothy Merrigan, M.D.Walnut Creek, CA 945981063442945
Common questions
What is Pei Casas, M.D.'s NPI number?
Pei Casas, M.D.'s National Provider Identifier (NPI) is 1922234236, issued on Jun 2, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Pei Casas, M.D. located?
The NPPES record lists a practice address at 320 Lennon LN, Walnut Creek, CA, 94598. Phone: (925) 906-2327. Providers update this record themselves, so call before visiting.
How can I verify Pei Casas, M.D.'s license?
NPPES lists California license number A107610, 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 Pei Casas, M.D. prescribe under Medicare Part D?
In 2024, Pei Casas, M.D. had 5,035 Medicare Part D claims for 590 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.