Ray Mak
Family Medicine Physician · Guerneville, CA
Ray Mak is a family medicine physician with a practice address in Guerneville, California, and NPI 1972253292, issued on Mar 28, 2022. Check the license (California A190402, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ray Mak
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A190402 CA
Self-reported in NPPES; status is on the state search - Practice location
- PO Box 1449, Guerneville, CA 95446
- Phone
- (707) 869-5977
- Enumerated
- Mar 28, 2022
- Record last updated
- Oct 13, 2025
- Medicare enrollment
- Enrolled (PECOS I20251128000684); accepts Medicare assignment
- Entity
- Type 1 · individual
Also registered at PO Box 1449
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Andrea Ginsberg, NPFamily Nurse Practitioner1376266163
Verify Ray Mak in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A190402Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average family medicine physician in 2024
246 Medicare Part D claims for 45 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Furosemide17 claims
- Atorvastatin Calcium15 claims
- Xarelto13 claims
- Trazodone Hcl12 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
- Santa Rosa Community Health CentersSanta Rosa, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
4 family medicine physician records list a practice address in Guerneville
They are 4 of the 51 NPPES records with a practice address in Guerneville, and 17,133 family medicine physician records in California.
All 4 in Guerneville → All 17,133 in California → Every provider in Guerneville →
Other family medicine physician records in California
- Omer Aba-Omer, MDSanta Monica, CA1649702093
- Michelle Ababa, MDWilmington, CA1710922513
- Anna Tzeitel Abalos, MDRoseville, CA1720200017
- Adan Abarca, MDAnaheim, CA1760553689
- Vanessa Abarca, DOVentura, CA1952040859
- Lorraine Abate, M.D.Sacramento, CA1104840008
- Robert Abatecola, MDCastro Valley, CA1669551719
- Romeo Abaya, M.D.Cottonwood, CA1598053506
- Effiem Abbah, MD, MPHSan Francisco, CA1821185133
- Khuzeman Abbasi, MDSanta Rosa, CA1841979952
Common questions
What is Ray Mak's NPI number?
Ray Mak's National Provider Identifier (NPI) is 1972253292, issued on Mar 28, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Ray Mak located?
The NPPES record lists a practice address at PO Box 1449, Guerneville, CA, 95446. Phone: (707) 869-5977. Providers update this record themselves, so call before visiting.
How can I verify Ray Mak's license?
NPPES lists California license number A190402, 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 Ray Mak prescribe under Medicare Part D?
In 2024, Ray Mak had 246 Medicare Part D claims for 45 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.