Dr. Stephan Stellmacher, DO, FACP
- Medicare services, 2024
- 22
- Medicare patients, 2024
- 39
- Part D claims, 2024
- 127
- Hospital affiliations
- 1
- Industry payments
- $105
- Practice address
- 4212 North 16th Street, Phoenix, AZ 85016
- Practice phone
- Call (602) 263-1200
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Stellmacher's professional email, personal email and mobile number
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Dr. Stephan Stellmacher is an internist in Phoenix, Arizona
Dr. Stellmacher practices at Phoenix Indian Medical Center in Phoenix, Arizona, part of U.S. Department of Health and Human Services.
Dr. Stellmacher's NPI, 1588726970, was assigned on December 14, 2006. Dr. Stellmacher holds Arizona license 3828.
- NPI
- 1588726970NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1355254673
- NPI enumeration date
- December 14, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (602) 263-1200
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 62
- Medical school graduation
- 1990
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Stephan Stellmacher practices at Phoenix Indian Medical Center in Phoenix, Arizona
Dr. Stellmacher's primary practice is Phoenix Indian Medical Center, at 4212 North 16th Street, Phoenix, AZ 85016 in Maricopa County. The practice phone is (602) 263-1200.
- Phoenix Indian Medical Center4212 North 16th Street, Phoenix, AZ 85016 · Maricopa CountyPhone(602) 263-1200
Source: Dmand AI Affiliation Data
Dr. Stephan Stellmacher is affiliated with 1 site of care and 1 medical group
Dr. Stellmacher's primary practice is Phoenix Indian Medical Center in Phoenix, Arizona, part of U.S. Department of Health and Human Services. The medical group on file is Phoenix Indian Medical Center.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Stephan Stellmacher's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Stellmacher practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Phoenix Indian Medical Center | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Stephan Stellmacher is one of 2,420 internists in Arizona
Internal medicine is Dr. Stellmacher's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Stellmacher is licensed in Arizona.
Specialties and state licenses
- Internal medicine, ArizonaPrimary
Internists near Dr. Stellmacher
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Stephan Stellmacher billed Medicare for 22 services in 2024
CMS data shows 22 Medicare services from Dr. Stellmacher across 1 procedure code in 2024, for 39 Medicare patients. Medicare paid $1,944 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Stellmacher's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 232024: 224%
Dr. Stellmacher compared with the Arizona median for internists, 2024
- Dr. Stellmacher
- Arizona median
- Medicare services
- 22vs 47695% below
- Medicare patients
- 39vs 20581% below
- Part D claims
- 40vs 26085% below
Medians across 2,300 internists in Arizona with Dmand AI profiles that report each measure.
Dr. Stellmacher's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Stephan Stellmacher treated 39 Medicare patients in 2024, average age 71
CMS counts 39 Medicare patients who saw Dr. Stellmacher in 2024. The largest group is 65 to 74, with 15 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 64% are also on Medicaid. Their average risk score is 1.88, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Stellmacher's median patient age at 64, with 43% women.
Dr. Stellmacher's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Stellmacher's Medicare patients by sex, 2024
- Women2051%
- Men1949%
Chronic conditions among Dr. Stellmacher's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Diabetes64%
- Chronic kidney disease56%
- Ischemic heart disease44%
- Mood disorders38%
- Arthritis36%
- Depression33%
Share of Medicare patients with each condition. A patient can have several.
Dr. Stellmacher's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 64
Patient panel by sex, all payers
- Women43%
- Men57%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Stephan Stellmacher wrote 127 Medicare Part D claims in 2024
In 2024, Dr. Stellmacher wrote 127 Medicare Part D claims for 23 patients. CMS names the drug for 40 of them, across 3 drugs with 11 or more claims each, at $87,342 in total drug cost. In 2023, CMS named 159 claims across 10 drugs.
Dr. Stellmacher's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Stellmacher's Part D claims, 2024
- Antibiotics9%11 of 127 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1592024: 4075%
Drugs named by CMS: 3 in 2024, 10 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Stephan Stellmacher takes part in Medicare
Dr. Stellmacher accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Stephan Stellmacher received $105 in industry payments from 2022 to 2023
CMS Open Payments shows 2 general payments to Dr. Stellmacher from 1 drug or device company from 2022 to 2023. Food and beverage make up the largest share, 100% of the total. Gilead Sciences, Inc. paid the most, $105.
General payments to Dr. Stellmacher by program year, 2022 to 2023
Companies that paid Dr. Stellmacher the most, 2022 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Stephan Stellmacher's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Stephan Stellmacher
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Stephan Stellmacher's NPI number?
Dr. Stephan Stellmacher's NPI number is 1588726970. It was assigned on December 14, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Stephan Stellmacher?
Dr. Stephan Stellmacher is an internist in Phoenix, Arizona. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Stephan Stellmacher practice?
Dr. Stellmacher practices at 4212 North 16th Street, Phoenix, AZ 85016. Dr. Stellmacher's primary practice is Phoenix Indian Medical Center in Phoenix, Arizona, part of U.S. Department of Health and Human Services.
What is Dr. Stephan Stellmacher's office phone number?
The practice phone on file for Dr. Stellmacher is (602) 263-1200.
What is Dr. Stephan Stellmacher's medical license number?
Dr. Stellmacher holds Arizona license 3828.
Which hospitals is Dr. Stephan Stellmacher affiliated with?
Dr. Stellmacher practices at Phoenix Indian Medical Center in Phoenix, Arizona.
What medical group is Dr. Stephan Stellmacher part of?
Dr. Stellmacher is linked to Phoenix Indian Medical Center.
Does Dr. Stephan Stellmacher accept Medicare?
Yes. CMS data shows Dr. Stellmacher billed Medicare for 22 services in 2024, and Dr. Stellmacher accepts Medicare assignment.
How many Medicare patients does Dr. Stephan Stellmacher see?
CMS counts 39 Medicare patients who saw Dr. Stellmacher in 2024, with an average age of 71.
What services does Dr. Stephan Stellmacher bill to Medicare?
In 2024, Dr. Stellmacher's most billed Medicare services were hospital inpatient care (99233).
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What drugs does Dr. Stephan Stellmacher prescribe most?
In 2024 Medicare Part D data, Dr. Stellmacher's most prescribed drugs by claims were Biktarvy, Albuterol Sulfate Hfa and Ozempic.
Has Dr. Stephan Stellmacher received payments from drug or device companies?
CMS Open Payments shows $105 in general payments to Dr. Stellmacher from 1 company from 2022 to 2023. The largest total came from Gilead Sciences, Inc.
How long has Dr. Stephan Stellmacher been practicing?
Dr. Stellmacher graduated from medical school in 1990, 36 years ago.
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