Walter C. Maack, M.D.
Family Medicine Physician · Healdsburg, CA
Walter C. Maack, M.D. is a family medicine physician with a practice address in Healdsburg, California, and NPI 1588765416, issued on Sep 25, 2006. Check the license (California G23577, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Walter C. Maack
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- G23577 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1375 University Avenue, Healdsburg, CA 95448
- Phone
- (707) 431-6500
- Enumerated
- Sep 25, 2006
- Record last updated
- Sep 11, 2025
- Medicaid ID
- 00G235770 CA
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 1375 University Avenue
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Keith Enders, LCSWClinical Social Worker1639576226
- Marc Paris, M.D.Emergency Medicine Physician1114028040
Verify Walter C. Maack in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G23577Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
100% fewer Medicare Part D claims than the average family medicine physician in 2024
14 Medicare Part D claims, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
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.
Walter C. Maack among 17,133 family medicine physician records in California
Walter C. Maack, 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 updated2025 · 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).
27 family medicine physician records list a practice address in Healdsburg
They are 27 of the 226 NPPES records with a practice address in Healdsburg, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Healdsburg → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Richard Andolsen, MDHealdsburg, CA 954481376533638
- Robert Azcarraga, MDHealdsburg, CA 954481477548709
- Mary Berg, MDHealdsburg, CA 954481487724290
- Maria Garcia, MDHealdsburg, CA 954481073500732
- Andre Gerard, MDHealdsburg, CA 954481891722500
- Jeffrey Meckler, MDHealdsburg, CA 954481316932635
- Thomas Neal, M.D.Healdsburg, CA 954481649298910
- Douglas Pile, MDHealdsburg, CA 954481710914577
Common questions
What is Walter C. Maack, M.D.'s NPI number?
Walter C. Maack, M.D.'s National Provider Identifier (NPI) is 1588765416, issued on Sep 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Walter C. Maack, M.D. located?
The NPPES record lists a practice address at 1375 University Avenue, Healdsburg, CA, 95448. Phone: (707) 431-6500. Providers update this record themselves, so call before visiting.
How can I verify Walter C. Maack, M.D.'s license?
NPPES lists California license number G23577, 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 Walter C. Maack, M.D. prescribe under Medicare Part D?
In 2024, Walter C. Maack, M.D. had 14 Medicare Part D claims; 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.