Dr. Christopher M. Callahan, MD
- Medicare services, 2023
- 46
- Medicare patients, 2024
- 19
- Part D claims, 2024
- 76
- Hospital affiliations
- 1
- Industry payments
- $84
- Practice address
- 720 Eskenazi Avenue, Indianapolis, IN 46202
- Practice phone
- Call (317) 880-4818
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Callahan's professional email, personal email and mobile number
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Dr. Christopher M. Callahan is a geriatric medicine (internal medicine) physician in Indianapolis, Indiana
Dr. Callahan practices at Sidney & Lois Eskenazi Hospital in Indianapolis, Indiana, part of Health & Hospital Corporation of Marion County.
Dr. Callahan's NPI, 1104867043, was assigned on June 10, 2006. Dr. Callahan graduated from Saint Louis University School of Medicine in 1985. Dr. Callahan holds Indiana license 01036319A.
- NPI
- 1104867043NPI Registry (opens in a new tab)
- NPI enumeration date
- June 10, 2006
- NPI status
- Active
- Practice phone
- (317) 880-4818
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 67
- Medical school graduation
- 1985
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Christopher M. Callahan practices at Sidney & Lois Eskenazi Hospital in Indianapolis, Indiana
Dr. Callahan's primary practice is Sidney & Lois Eskenazi Hospital, at 720 Eskenazi Avenue, Indianapolis, IN 46202 in Marion County. The practice phone is (317) 880-4818.
- Sidney & Lois Eskenazi Hospital720 Eskenazi Avenue, Indianapolis, IN 46202 · Marion CountyPhone(317) 880-4818
Source: Dmand AI Affiliation Data
Dr. Christopher M. Callahan is affiliated with 4 sites of care and 3 medical groups
Dr. Callahan's primary practice is Sidney & Lois Eskenazi Hospital in Indianapolis, Indiana, part of Health & Hospital Corporation of Marion County. The medical group on file is Eskenazi Health. Dmand AI also links Dr. Callahan to 3 more group practices and clinics and 2 medical groups, each named with a free account. Dr. Callahan's employer is on file too: a hospital.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Christopher M. Callahan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Callahan practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Sidney & Lois Eskenazi Hospital | Available with a free account |
| +3 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Christopher M. Callahan is one of 45 geriatric medicine (internal medicine) physicians in Indiana
Geriatric medicine is Dr. Callahan's primary specialty in the NPI Registry, under taxonomy code 207RG0300X. Dr. Callahan is licensed in Indiana.
Specialties and state licenses
- Geriatric medicine (internal medicine), IndianaPrimary
Geriatric medicine (internal medicine) physicians near Dr. Callahan
Counts of geriatric medicine (internal medicine) physicians 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. Christopher M. Callahan billed Medicare for 46 services in 2023
CMS data shows 46 Medicare services from Dr. Callahan across 2 procedure codes in 2023, all of them office visits, for 19 Medicare patients. Medicare paid $2,417 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Callahan's Medicare services by type, 2022 to 2023
- 2022
- 2023
- Office and hospital visits
- 2022: 542023: 4615%
Dr. Callahan compared with the Indiana median for geriatric medicine (internal medicine) physicians, 2023
- Dr. Callahan
- Indiana median
- Medicare services
- 46vs 42589% below
- Medicare patients
- 19vs 16288% below
- Part D claims
- 42vs 35488% below
Medians across 50 geriatric medicine (internal medicine) physicians in Indiana with Dmand AI profiles that report each measure.
Dr. Callahan's most billed Medicare procedure codes, 2023
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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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Callahan and other geriatric medicine (internal medicine) physicians in Indiana.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Christopher M. Callahan treated 19 Medicare patients in 2024, average age 75
CMS counts 19 Medicare patients who saw Dr. Callahan in 2024. 74% of them have high blood pressure, and 63% have depression. Their average risk score is 0.93, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Callahan's median patient age at 78, with 100% women.
Chronic conditions among Dr. Callahan's Medicare patients, 2024
- High blood pressure74%
- Depression63%
- Mood disorders63%
- Alzheimer's and dementia58%
- High cholesterol58%
Share of Medicare patients with each condition. A patient can have several.
Dr. Callahan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 78
Patient panel by sex, all payers
- Women100%
- Men0%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Christopher M. Callahan wrote 76 Medicare Part D claims in 2024
In 2024, Dr. Callahan wrote 76 Medicare Part D claims for 24 patients. 100% of them were for generic drugs. CMS names the drug for 42 of them, across 2 drugs with 11 or more claims each, at $647 in total drug cost. In 2023, CMS named 39 claims across 1 drug.
Dr. Callahan'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.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 392024: 428%
Drugs named by CMS: 2 in 2024, 1 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
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Dr. Christopher M. Callahan received $84 in industry payments in 2022
CMS Open Payments shows 3 general payments to Dr. Callahan from 2 drug and device companies in 2022. Food and beverage make up the largest share, 80% of the total. Eli Lilly and Company paid the most, $59.
General payments to Dr. Callahan by kind, 2022 to 2022
- Food and beverage$6880%
- Education$1620%
Companies that paid Dr. Callahan the most, 2022 to 2022
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Christopher M. Callahan graduated from Saint Louis University School of Medicine
Dr. Callahan graduated from Saint Louis University School of Medicine in 1985.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Christopher M. Callahan'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) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| 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. Christopher M. Callahan
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. Christopher M. Callahan's NPI number?
Dr. Christopher M. Callahan's NPI number is 1104867043. It was assigned on June 10, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Christopher M. Callahan?
Dr. Christopher M. Callahan is a geriatric medicine (internal medicine) physician in Indianapolis, Indiana. The primary specialty in the NPI Registry is Geriatric Medicine (Internal Medicine) Physician (taxonomy code 207RG0300X).
Where does Dr. Christopher M. Callahan practice?
Dr. Callahan practices at 720 Eskenazi Avenue, Indianapolis, IN 46202. Dr. Callahan's primary practice is Sidney & Lois Eskenazi Hospital in Indianapolis, Indiana, part of Health & Hospital Corporation of Marion County. Dmand AI also links Dr. Callahan to 3 group practices and clinics and 2 medical groups.
What is Dr. Christopher M. Callahan's office phone number?
The practice phone on file for Dr. Callahan is (317) 880-4818.
What is Dr. Christopher M. Callahan's medical license number?
Dr. Callahan holds Indiana license 01036319A.
Which hospitals is Dr. Christopher M. Callahan affiliated with?
Dr. Callahan practices at Sidney & Lois Eskenazi Hospital in Indianapolis, Indiana.
What medical group is Dr. Christopher M. Callahan part of?
Dr. Callahan is linked to Eskenazi Health. Dmand AI links Dr. Callahan to 2 more medical groups.
Does Dr. Christopher M. Callahan accept Medicare?
Yes. CMS data shows Dr. Callahan billed Medicare for 46 services in 2023.
How many Medicare patients does Dr. Christopher M. Callahan see?
CMS counts 19 Medicare patients who saw Dr. Callahan in 2024, with an average age of 75.
What services does Dr. Christopher M. Callahan bill to Medicare?
In 2023, Dr. Callahan's most billed Medicare services were office visit, established patient (99213) and office visit, established patient (99214).
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Where did Dr. Christopher M. Callahan go to medical school?
Dr. Callahan graduated from Saint Louis University School of Medicine in 1985.
What drugs does Dr. Christopher M. Callahan prescribe most?
In 2024 Medicare Part D data, Dr. Callahan's most prescribed drugs by claims were Donepezil HCl and Memantine HCl.
Has Dr. Christopher M. Callahan received payments from drug or device companies?
CMS Open Payments shows $84 in general payments to Dr. Callahan from 2 companies from 2022 to 2022. The largest total came from Eli Lilly and Company.
How long has Dr. Christopher M. Callahan been practicing?
Dr. Callahan graduated from medical school in 1985, 41 years ago.
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