Stephan Stellmacher, DO-FACP
Internal Medicine Physician · Phoenix, AZ
Stephan Stellmacher, DO-FACP is an internal medicine physician with a practice address in Phoenix, Arizona, and NPI 1588726970, issued on Dec 14, 2006. Check the license (Arizona 3828, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- Stephan Stellmacher
- Credential
- DO-FACP
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 3828 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 4212 N 16TH St, Phoenix, AZ 85016
- Phone
- (602) 263-1200
- Enumerated
- Dec 14, 2006
- Record last updated
- Mar 17, 2026
- Fax
- (602) 263-1619
- Medicaid ID
- 109290 AZ
- Medicare enrollment
- Enrolled (PECOS I20220217002464); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,853 in Arizona → Look up another NPI →
Also registered at 4212 N 16TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Andrea Aarseth, RNCritical Care Medicine Registered Nurse1235297292
- Deirdre Abellada, RN, PHNRegistered Nurse1710259395
- Joby Abraham, RNRegistered Nurse1376814046
- Frederick Abramek, MS, PHARMACISTPharmacist1528278736
- Karen AcostaRegistered Nurse1659748671
- Danton AdairRegistered Nurse1114387917
Verify Stephan Stellmacher in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 3828Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average internal medicine physician in 2024
127 Medicare Part D claims for 23 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 57% of claims.
Most prescribed
- Biktarvy18 claims
- Albuterol Sulfate Hfa11 claims
- Ozempic11 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
- Dhew Ind Hlth SV Hlth Svs And Mntl Hlth AdmPhoenix, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Stephan Stellmacher among 2,853 internal medicine physician records in Arizona
Stephan Stellmacher, DO-FACP is one of 2,853 internal medicine physician records with a practice address in Arizona. 75% 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 13% of them.
- NPI issued2006 · 13% of these records are older, 55% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated1990 · median 2003 among the 1,643 with a school on file
- Record last updated2026 · 51% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
695 internal medicine physician records list a practice address in Phoenix
They are 695 of the 31,399 NPPES records with a practice address in Phoenix, and 2,853 internal medicine physician records in Arizona.
All 2,853 in Arizona → Every provider in Phoenix → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Omer Farooq, M.D.Phoenix, AZ 850161952333262
- Laurie Farricielli, MDPhoenix, AZ 850161124014725
- Coleene Fernando, MDPhoenix, AZ 850161952383119
- Edward Hardiman, MDPhoenix, AZ 850161255341897
- Paden Hendrickson, MDPhoenix, AZ 850161154434637
- Bruce Packer, M.D.Phoenix, AZ 850161356348338
- Arthur Pelberg, M.D.Phoenix, AZ 850161285749424
- Maitreyi Prabhu, MDPhoenix, AZ 850161619994647
Common questions
What is Stephan Stellmacher, DO-FACP's NPI number?
Stephan Stellmacher, DO-FACP's National Provider Identifier (NPI) is 1588726970, issued on Dec 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Stephan Stellmacher, DO-FACP located?
The NPPES record lists a practice address at 4212 N 16TH St, Phoenix, AZ, 85016. Phone: (602) 263-1200. Providers update this record themselves, so call before visiting.
How can I verify Stephan Stellmacher, DO-FACP's license?
NPPES lists Arizona license number 3828, 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 Stephan Stellmacher, DO-FACP prescribe under Medicare Part D?
In 2024, Stephan Stellmacher, DO-FACP had 127 Medicare Part D claims for 23 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.