Cleo Tsolakoglou-Williams, M.D
Family Medicine Physician · Pasadena, CA
Cleo Tsolakoglou-Williams, M.D is a family medicine physician with a practice address in Pasadena, California, and NPI 1538243126, issued on Oct 24, 2006. Check the license (California A52191, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Cleo Tsolakoglou-Williams
- Credential
- M.D
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A52191 CA
Self-reported in NPPES; status is on the state search - Practice location
- 960 E Green St, Pasadena, CA 91106
- Phone
- (626) 577-4455
- Enumerated
- Oct 24, 2006
- Record last updated
- Jul 9, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (626) 449-2759
- Medicaid ID
- 00A521910 CA
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 960 E Green St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Cleo Tsolakoglou-Williams in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A52191Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
92% fewer Medicare Part D claims than the average family medicine physician in 2024
296 Medicare Part D claims for 44 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Ozempic24 claims
- Levothyroxine Sodium20 claims
- Atorvastatin Calcium16 claims
- Rosuvastatin Calcium16 claims
- Tamsulosin Hcl14 claims
- Amlodipine Besylate12 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.
Industry payments in 2024: $522.32
4 payments; by number, the most common kind was food and beverage; the largest payer was Janssen Pharmaceuticals, Inc. The 55,478 providers of this specialty with any payment received $902.55 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Cleo Tsolakoglou-Williams among 17,133 family medicine physician records in California
Cleo Tsolakoglou-Williams, 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 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 59% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 62% of these records are
- Record last updated2007 · 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).
Family Medicine Physician providers in California
There are 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Pasadena → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Glen Apramian, M.D.Pasadena, CA 911061760885065
- Edward Chiang, DOPasadena, CA 911061104876481
- Craig Johnson, M.D.Pasadena, CA 911061336191063
- Stephanie Long, MDPasadena, CA 911061043448236
- Kimberley Shine, MDPasadena, CA 911061598724114
- Arthur Ayvazian, MDPasadena, CA 911051023500527
- Helen Banh, DOPasadena, CA 911051386223998
- Earl Canson, M.D, MPHPasadena, CA 911071609173996
Common questions
What is Cleo Tsolakoglou-Williams, M.D's NPI number?
Cleo Tsolakoglou-Williams, M.D's National Provider Identifier (NPI) is 1538243126, issued on Oct 24, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Cleo Tsolakoglou-Williams, M.D located?
The NPPES record lists a practice address at 960 E Green St, Pasadena, CA, 91106. Phone: (626) 577-4455. Providers update this record themselves, so call before visiting.
How can I verify Cleo Tsolakoglou-Williams, M.D's license?
NPPES lists California license number A52191, 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 Cleo Tsolakoglou-Williams, M.D prescribe under Medicare Part D?
In 2024, Cleo Tsolakoglou-Williams, M.D had 296 Medicare Part D claims for 44 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.