Dr. John J. Callahan, MD
- Medicare services, 2024
- 736
- Medicare patients, 2024
- 275
- Part D claims, 2024
- 166
- MIPS score, 2024
- 90
- Hospital affiliations
- 2
- Practice address
- 3921 Sheridan Dr, Buffalo, NY 14226
- Practice phone
- Call (716) 250-6520
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Buffalo Surgery Center LLC
Buffalo, New York
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 J. Callahan is an orthopaedic hand surgery physician in Buffalo, New York
Dr. Callahan practices at Buffalo Surgery Center LLC in Buffalo, New York.
Dr. Callahan's NPI, 1952338048, was assigned on June 26, 2006. Dr. Callahan graduated from State University of NY Upstate Medical University in 1987. Dr. Callahan holds New York license 192324.
- NPI
- 1952338048NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4284661414
- NPI enumeration date
- June 26, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (716) 250-6520
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 65
- Medical school graduation
- 1987
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John J. Callahan practices at Buffalo Surgery Center LLC in Buffalo, New York
Dr. Callahan's primary practice is Buffalo Surgery Center LLC, at 3921 Sheridan Dr, Buffalo, NY 14226 in Erie County. The practice phone is (716) 250-6520.
- Buffalo Surgery Center LLC3921 Sheridan Dr, Buffalo, NY 14226 · Erie CountyPhone(716) 250-6520
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. John J. Callahan is affiliated with 4 sites of care and 1 medical group
Dr. Callahan's primary practice is Buffalo Surgery Center LLC in Buffalo, New York. Dr. Callahan is also affiliated with Mercy Hospital of Buffalo. The medical group on file is Excelsior Orthopaedics. Dmand AI also links Dr. Callahan to 1 more hospital and 1 group practice or clinic, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. John J. Callahan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Callahan practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Buffalo Surgery Center LLC | Available with a free account |
| +3 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across each health system and 6.2K+ hospitals, with verified contacts in the same login.
Dr. John J. Callahan is one of 174 orthopaedic hand surgery physicians in New York
Hand surgery is Dr. Callahan's primary specialty in the NPI Registry, under taxonomy code 207XS0106X. Dr. Callahan is licensed in New York.
Specialties and state licenses
- Orthopaedic hand surgery, New YorkPrimary
Orthopaedic hand surgery physicians near Dr. Callahan
Counts of orthopaedic hand surgery 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. John J. Callahan billed Medicare for 736 services in 2024
CMS data shows 736 Medicare services from Dr. Callahan across 13 procedure codes in 2024, for 275 Medicare patients. Medicare paid $32,692 for them.
Dr. Callahan's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Imaging
- 2023: 2372024: 2568%
- Drugs given in the office
- 2023: 2482024: 20717%
- Office and hospital visits
- 2023: 1882024: 16313%
- Surgery
- 2023: 1352024: 11019%
Where Dr. Callahan's Medicare services took place, 2024
- In an office66490%
- In a facility7210%
Dr. Callahan compared with the New York median for orthopaedic hand surgery physicians, 2024
- Dr. Callahan
- New York median
- Medicare services
- 736vs 1,17037% below
- Medicare patients
- 275vs 2926% below
- Part D claims
- 123vs 393.2 times
Medians across 166 orthopaedic hand surgery physicians 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.
Need commercial claims for Dr. Callahan?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Callahan and other orthopaedic hand surgery physicians in New York.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John J. Callahan treated 275 Medicare patients in 2024, average age 71
CMS counts 275 Medicare patients who saw Dr. Callahan in 2024. The largest group is 65 to 74, with 127 patients. 75% of them have high cholesterol, and 71% have high blood pressure. 23% are also on Medicaid. Their average risk score is 1.13, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Callahan's median patient age at 62, with 61% women.
Dr. Callahan's Medicare patients by age, 2024
Dr. Callahan's Medicare patients by sex, 2024
- Women17564%
- Men10036%
Chronic conditions among Dr. Callahan's Medicare patients, 2024
- High cholesterol75%
- High blood pressure71%
- Arthritis69%
- Anxiety33%
- Chronic kidney disease28%
- Diabetes28%
- Mood disorders28%
- Depression26%
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 62
Patient panel by sex, all payers
- Women61%
- Men39%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John J. Callahan wrote 166 Medicare Part D claims in 2024
In 2024, Dr. Callahan wrote 166 Medicare Part D claims for 113 patients. 98% of them were for generic drugs. CMS names the drug for 123 of them, across 4 drugs with 11 or more claims each, at $653 in total drug cost. In 2023, CMS named 141 claims across 5 drugs.
Dr. Callahan's Part D claims by kind of drug, 2024
- Generic163 claims98%
- Brand-name and other3 claims2%
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.
Drug classes CMS tracks in Dr. Callahan's Part D claims, 2024
- Opioids54%90 of 166 claims
- Antibiotics22%36 of 166 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: 1412024: 12313%
Drugs named by CMS: 4 in 2024, 5 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
Dr. John J. Callahan scored 90 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 90 out of 100 for Dr. Callahan for performance year 2024, reported as part of a group. Dr. Callahan accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Callahan's MIPS scores, performance year 2024
- 90of 100Final score
- 89.9of 100Quality
- 88of 100Promoting Interoperability
- 40of 100Improvement Activities
- 83of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Removal of nail tissue: 1 to 10 procedures (CMS shows small counts as a range)
Upper limb (arm) arthroscopy (minimally invasive joint repair): 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. John J. Callahan received $4,645 in industry payments from 2016 to 2025
CMS Open Payments shows 63 general payments to Dr. Callahan from 21 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 53% of the total. Sonex Health, Inc. paid the most, $1,603.
General payments to Dr. Callahan by program year, 2016 to 2025
General payments to Dr. Callahan by kind, 2016 to 2025
- Food and beverage$2,44753%
- Education$1,00022%
- Travel and lodging$97721%
- Device or supply loans$1714%
- Speaker and faculty fees$501%
Companies that paid Dr. Callahan the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John J. Callahan graduated from State University of NY Upstate Medical University
Dr. Callahan graduated from State University of NY Upstate Medical University in 1987.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. John J. 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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand 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)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (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 J. 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 J. Callahan's NPI number?
Dr. John J. Callahan's NPI number is 1952338048. It was assigned on June 26, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. John J. Callahan?
Dr. John J. Callahan is an orthopaedic hand surgery physician in Buffalo, New York. The primary specialty in the NPI Registry is Orthopaedic Hand Surgery Physician (taxonomy code 207XS0106X).
Where does Dr. John J. Callahan practice?
Dr. Callahan practices at 3921 Sheridan Dr, Buffalo, NY 14226. Dr. Callahan's primary practice is Buffalo Surgery Center LLC in Buffalo, New York. Dmand AI also links Dr. Callahan to 1 hospital and 1 group practice or clinic.
What is Dr. John J. Callahan's office phone number?
The practice phone on file for Dr. Callahan is (716) 250-6520.
What is Dr. John J. Callahan's medical license number?
Dr. Callahan holds New York license 192324.
Which hospitals is Dr. John J. Callahan affiliated with?
Dr. Callahan is affiliated with Mercy Hospital of Buffalo. Dmand AI links Dr. Callahan to 1 more hospital.
What medical group is Dr. John J. Callahan part of?
Dr. Callahan is linked to Excelsior Orthopaedics.
Does Dr. John J. Callahan accept Medicare?
Yes. CMS data shows Dr. Callahan billed Medicare for 736 services in 2024, and Dr. Callahan accepts Medicare assignment.
What is Dr. John J. Callahan's MIPS score?
Dr. Callahan's MIPS final score for performance year 2024 is 90 out of 100, reported as part of a group.
How many Medicare patients does Dr. John J. Callahan see?
CMS counts 275 Medicare patients who saw Dr. Callahan in 2024, with an average age of 71.
Show 5 more questionsShow fewer questions
What services does Dr. John J. Callahan bill to Medicare?
In 2024, Dr. Callahan's most billed Medicare services were injected or infused drug (J1100), diagnostic imaging (73130) and office visit, established patient (99213).
Where did Dr. John J. Callahan go to medical school?
Dr. Callahan graduated from State University of NY Upstate Medical University in 1987.
What drugs does Dr. John J. Callahan prescribe most?
In 2024 Medicare Part D data, Dr. Callahan's most prescribed drugs by claims were Hydrocodone-Acetaminophen, Cephalexin and Methylprednisolone.
Has Dr. John J. Callahan received payments from drug or device companies?
CMS Open Payments shows $4,645 in general payments to Dr. Callahan from 21 companies from 2016 to 2025. The largest total came from Sonex Health, Inc.
How long has Dr. John J. Callahan been practicing?
Dr. Callahan graduated from medical school in 1987, 39 years ago.
Selling to hand surgery practices?
See orthopaedic hand surgery physicians in New York by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card