William Michael Marsh, M.D.
General Practice Physician · Cave Creek, AZ
William Michael Marsh, M.D. is a general practice physician with a practice address in Cave Creek, Arizona, and NPI 1659385441, issued on Jul 28, 2006. Check the license (Arizona 13237, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- William Michael Marsh
- Credential
- M.D.
- Primary taxonomy
- General Practice Physician 208D00000X
- License number
- 13237 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 30012 N Cave Creek RD Ste 105, Cave Creek, AZ 85331
- Phone
- (480) 585-0880
- Enumerated
- Jul 28, 2006
- Record last updated
- Oct 17, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (480) 585-0882
- Entity
- Type 1 · individual
8 nearest general practice physician records → All 228 in Arizona → Look up another NPI →
Verify William Michael Marsh in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 13237Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
69% fewer Medicare Part D claims than the average general practice physician in 2024
929 Medicare Part D claims for 162 beneficiaries, against an average of 3,030 among the 8,395 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims.
Most prescribed
- Ezetimibe68 claims
- Atorvastatin Calcium56 claims
- Levothyroxine Sodium53 claims
- Losartan Potassium43 claims
- Metoprolol Succinate35 claims
- Amlodipine Besylate33 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.
William Michael Marsh among 228 general practice physician records in Arizona
William Michael Marsh, M.D. is one of 228 general practice physician records with a practice address in Arizona. 48% 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 8% of them.
- NPI issued2006 · 8% of these records are older, 69% newer
- In a Medicare fileYes · 48% of these records are
- In the CMS Doctors and Clinicians fileNo · 24% of these records are
- Record last updated2018 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208D00000X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
General Practice Physician providers in Arizona
There are 228 general practice physician records in Arizona.
All 228 in Arizona → Every provider in Cave Creek → General Practice Physician nationwide →
The 8 general practice physician records with the nearest ZIP codes
- Madison Phillips, MSWEhrenberg, AZ 853341366080475
- Christine Briones, M.D.El Mirage, AZ 853351447275292
- Danielle Briden, DOSan Luis, AZ 853361720329253
- Eduardo Vinluan, MDBuckeye, AZ 853261093948192
- Natalisse Wahlstrom-Davila, MDBuckeye, AZ 853261366145591
- Kevin Haselhorst, MDGoodyear, AZ 853381831170935
- Andrea Irving, D.O.Black Canyon City, AZ 853241780858878
- Samuel Nandin, M.D.Goodyear, AZ 853381124180054
Common questions
What is William Michael Marsh, M.D.'s NPI number?
William Michael Marsh, M.D.'s National Provider Identifier (NPI) is 1659385441, issued on Jul 28, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William Michael Marsh, M.D. located?
The NPPES record lists a practice address at 30012 N Cave Creek RD Ste 105, Cave Creek, AZ, 85331. Phone: (480) 585-0880. Providers update this record themselves, so call before visiting.
How can I verify William Michael Marsh, M.D.'s license?
NPPES lists Arizona license number 13237, as entered by the provider. Search the Arizona Medical Board at https://www.azmd.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William Michael Marsh, M.D. prescribe under Medicare Part D?
In 2024, William Michael Marsh, M.D. had 929 Medicare Part D claims for 162 beneficiaries; the average among general practice physician prescribers was 3,030. 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.