Dr. John M. Callahan, MD
- Medicare services, 2024
- 81
- Medicare patients, 2024
- 79
- Part D claims, 2024
- 38
- Hospital affiliations
- 2
- Industry payments
- $49
- Practice address
- 736 Irving Avenue, Syracuse, NY 13210
- Practice phone
- Call (315) 470-7449
- 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
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. John M. Callahan is a hospitalist in Syracuse, New York
Dr. Callahan practices at Crouse Hospital in Syracuse, New York, part of Crouse Health.
Dr. Callahan's NPI, 1568454528, was assigned on August 16, 2005. Dr. Callahan graduated from SUNY Upstate Medical University in 1996. Dr. Callahan holds New York license 208546.
- NPI
- 1568454528NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4981659703
- NPI enumeration date
- August 16, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (315) 470-7449
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 66
- Medical school graduation
- 1996
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John M. Callahan practices at Crouse Hospital in Syracuse, New York
Dr. Callahan's primary practice is Crouse Hospital, at 736 Irving Avenue, Syracuse, NY 13210 in Onondaga County. The practice phone is (315) 470-7449.
- Crouse Hospital736 Irving Avenue, Syracuse, NY 13210 · Onondaga CountyPhone(315) 470-7449
Source: Dmand AI Affiliation Data
Dr. John M. Callahan is affiliated with 5 sites of care and 5 medical groups
Dr. Callahan's primary practice is Crouse Hospital in Syracuse, New York, part of Crouse Health. Dr. Callahan is also affiliated with St. Joseph's Health Hospital. The medical group on file is St. Joseph's Physicians Primary Care Center - OB/GYN. Dmand AI also links Dr. Callahan to 4 more medical groups, 1 group practice or clinic, 1 home health agency and 1 hospice, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. John M. Callahan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Callahan practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Crouse Hospital | Available with a free account |
| +4 more sites and 4 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dmand AI maps EHR vendors, IT decision makers and buying committees across Crouse Health and 6.2K+ hospitals, with verified contacts in the same login.
Dr. John M. Callahan is one of 1,796 hospitalists in New York
Hospitalist is Dr. Callahan's primary specialty in the NPI Registry, under taxonomy code 208M00000X. Dr. Callahan is licensed in New York.
Specialties and state licenses
- Hospitalist, New YorkPrimary
Hospitalists near Dr. Callahan
Counts of hospitalists 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. John M. Callahan billed Medicare for 81 services in 2024
CMS data shows 81 Medicare services from Dr. Callahan across 2 procedure codes in 2024, for 79 Medicare patients. Medicare paid $6,270 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Callahan's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 922024: 8112%
Dr. Callahan compared with the New York median for hospitalists, 2024
- Dr. Callahan
- New York median
- Medicare services
- 81vs 38879% below
- Medicare patients
- 79vs 16352% below
- Part D claims
- 170vs 553.1 times
Medians across 1,696 hospitalists in New York with Dmand AI profiles that report each measure.
Dr. Callahan'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. John M. Callahan treated 79 Medicare patients in 2024, average age 83
CMS counts 79 Medicare patients who saw Dr. Callahan in 2024. The largest group is 85 and over, with 35 patients. 75% of them have high blood pressure, and 75% have high cholesterol. Their average risk score is 1.81, 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. Callahan's median patient age at 82, with 55% women.
Dr. Callahan's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Callahan's Medicare patients by sex, 2024
- Women5266%
- Men2734%
Chronic conditions among Dr. Callahan's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis67%
- Anxiety49%
- Mood disorders49%
- Ischemic heart disease44%
- Depression43%
- Chronic kidney disease41%
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 82
Patient panel by sex, all payers
- Women55%
- Men41%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John M. Callahan wrote 38 Medicare Part D claims in 2024
In 2024, Dr. Callahan wrote 38 Medicare Part D claims. 92% of them were for generic drugs. They cover 12 drugs, with $9,224 in total drug cost. In 2020, CMS named 13 claims across 1 drug.
Dr. Callahan's Part D claims by kind of drug, 2024
- Generic35 claims92%
- Brand-name and other3 claims8%
Dr. Callahan's most prescribed drugs by claims, 2021
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, 2020 to 2021
- 2020
- 2021
- Claims for drugs CMS names
- 2020: 132021: 1701208%
Drugs named by CMS: 12 in 2021, 1 in 2020.
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. John M. Callahan takes part in Medicare
Dr. Callahan 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. John M. Callahan received $49 in industry payments from 2017 to 2024
CMS Open Payments shows 3 general payments to Dr. Callahan from 3 drug and device companies from 2017 to 2024. Food and beverage make up the largest share, 100% of the total. Sunovion Pharmaceuticals Inc. paid the most, $19.
General payments to Dr. Callahan by program year, 2017 to 2024
Companies that paid Dr. Callahan the most, 2017 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John M. Callahan graduated from SUNY Upstate Medical University
Dr. Callahan graduated from SUNY Upstate Medical University in 1996.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. John 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) |
| 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) |
| 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. John 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. John M. Callahan's NPI number?
Dr. John M. Callahan's NPI number is 1568454528. It was assigned on August 16, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. John M. Callahan?
Dr. John M. Callahan is a hospitalist in Syracuse, New York. The primary specialty in the NPI Registry is Hospitalist Physician (taxonomy code 208M00000X).
Where does Dr. John M. Callahan practice?
Dr. Callahan practices at 736 Irving Avenue, Syracuse, NY 13210. Dr. Callahan's primary practice is Crouse Hospital in Syracuse, New York, part of Crouse Health. Dmand AI also links Dr. Callahan to 4 medical groups, 1 group practice or clinic, 1 home health agency and 1 hospice.
What is Dr. John M. Callahan's office phone number?
The practice phone on file for Dr. Callahan is (315) 470-7449.
What is Dr. John M. Callahan's medical license number?
Dr. Callahan holds New York license 208546.
Which hospitals is Dr. John M. Callahan affiliated with?
Dr. Callahan practices at Crouse Hospital in Syracuse, New York. Dr. Callahan is also affiliated with St. Joseph's Health Hospital.
What medical group is Dr. John M. Callahan part of?
Dr. Callahan is linked to St. Joseph's Physicians Primary Care Center - OB/GYN. Dmand AI links Dr. Callahan to 4 more medical groups.
Does Dr. John M. Callahan accept Medicare?
Yes. CMS data shows Dr. Callahan billed Medicare for 81 services in 2024, and Dr. Callahan accepts Medicare assignment.
How many Medicare patients does Dr. John M. Callahan see?
CMS counts 79 Medicare patients who saw Dr. Callahan in 2024, with an average age of 83.
What services does Dr. John M. Callahan bill to Medicare?
In 2024, Dr. Callahan's most billed Medicare services were nursing facility care (99304) and nursing facility care (99305).
Show 4 more questionsShow fewer questions
Where did Dr. John M. Callahan go to medical school?
Dr. Callahan graduated from SUNY Upstate Medical University in 1996.
What drugs does Dr. John M. Callahan prescribe most?
In 2021 Medicare Part D data, Dr. Callahan's most prescribed drugs by claims were Atorvastatin Calcium, Furosemide and Prednisone.
Has Dr. John M. Callahan received payments from drug or device companies?
CMS Open Payments shows $49 in general payments to Dr. Callahan from 3 companies from 2017 to 2024. The largest total came from Sunovion Pharmaceuticals Inc.
How long has Dr. John M. Callahan been practicing?
Dr. Callahan graduated from medical school in 1996, 30 years ago.
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