Christopher M. Callahan, MD
Geriatric Medicine (Internal Medicine) Physician · Indianapolis, IN
Christopher M. Callahan, MD is a geriatric medicine (internal medicine) physician with a practice address in Indianapolis, Indiana, and NPI 1104867043, issued on Jun 10, 2006. Check the license (Indiana 01036319A, as entered in NPPES) on the Medical Licensing Board of Indiana; the Medicare figures below come from public CMS files.
- Name
- Christopher M. Callahan
- Credential
- MD
- Primary taxonomy
- Geriatric Medicine (Internal Medicine) Physician 207RG0300X
- License number
- 01036319A IN
Self-reported in NPPES; status is on the state search - Practice location
- 1633 N Capitol Ave, Indianapolis, IN 46202
- Phone
- (317) 962-2929
- Enumerated
- Jun 10, 2006
- Record last updated
- Sep 15, 2025
- Fax
- (317) 962-2070
- Medicaid ID
- 100068500 IN
- Entity
- Type 1 · individual
8 nearest geriatric medicine (internal medicine) physician records → All 61 in Indiana → Look up another NPI →
Also registered at 1633 N Capitol Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Andrew Adams, MDAnesthesiology Physician1245720986
- Adnan Arseven, MDGeriatric Medicine (Internal Medicine) Physician1871573550
- Divya Arunachalam, M.D.Student in an Organized Health Care Education/Training Program1861755290
- Lynn BaldwinWomen's Health Nurse Practitioner1942435367
- Selena Bartelson-Andrews, M.D.Obstetrics & Gynecology Physician1922072628
- John Black, M.D.Infectious Disease Physician1932143500
Verify Christopher M. Callahan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Licensing Board of Indiana
Search for license 01036319ACheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average geriatric medicine (internal medicine) physician in 2024
76 Medicare Part D claims for 24 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Donepezil Hcl23 claims
- Memantine Hcl19 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.
Christopher M. Callahan among 61 geriatric medicine (internal medicine) physician records in Indiana
Christopher M. Callahan, MD is one of 61 geriatric medicine (internal medicine) physician records with a practice address in Indiana. 70% 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 21% of them.
- NPI issued2006 · 21% of these records are older, 43% newer
- In a Medicare fileYes · 70% of these records are
- In the CMS Doctors and Clinicians fileNo · 49% of these records are
- Record last updated2025 · 44% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0300X and a Indiana practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Geriatric Medicine (Internal Medicine) Physician providers in Indiana
There are 61 geriatric medicine (internal medicine) physician records in Indiana.
All 61 in Indiana → Every provider in Indianapolis → Geriatric Medicine (Internal Medicine) Physician nationwide →
The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes
- Adnan Arseven, MDIndianapolis, IN 462021871573550
- Malaz Boustani, MDIndianapolis, IN 462021891751079
- Jennifer Carnahan, MDIndianapolis, IN 462021578706099
- Steven Counsell, MDIndianapolis, IN 462021932166832
- Meredith Greene, MDIndianapolis, IN 462021700014362
- Robert Lebow, M.D.,Indianapolis, IN 462021356395107
- Kristi Lieb, MDIndianapolis, IN 462021417115080
- Felipe Perez, MDIndianapolis, IN 462021497798987
Common questions
What is Christopher M. Callahan, MD's NPI number?
Christopher M. Callahan, MD's National Provider Identifier (NPI) is 1104867043, issued on Jun 10, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Christopher M. Callahan, MD located?
The NPPES record lists a practice address at 1633 N Capitol Ave, Indianapolis, IN, 46202. Phone: (317) 962-2929. Providers update this record themselves, so call before visiting.
How can I verify Christopher M. Callahan, MD's license?
NPPES lists Indiana license number 01036319A, as entered by the provider. Search the Medical Licensing Board of Indiana at https://www.in.gov/pla/professions/physicians-home/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Christopher M. Callahan, MD prescribe under Medicare Part D?
In 2024, Christopher M. Callahan, MD had 76 Medicare Part D claims for 24 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. 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.