Physician Profile
John J. Callahan, MD
Unclaimed ProfileAbout Dr. Callahan
Based in Amherst, NY, John J. Callahan, MD is listed in the NPI registry under orthopaedic hand surgery. John graduated from State University of Ny Upstate Medical University in 1987. According to Medicare claims data, John cared for 425 Medicare patients across 736 services. The services billed most often include injection, dexamethasone sodium phosphate, 1 mg, x-ray of hand, minimum of 3 views, and established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (716) 250-9999
- Email not available
Practice Locations
3925 SHERIDAN DRIVE SUITE 100
Amherst, NY 14226
Conditions Commonly Evaluated or Treated
Within Hand Surgery generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Arthritis & Joints
- Bone Spur on Finger
- Hand and Wrist Arthritis
- Hand Arthritis
- Kienbock's Disease
- Stiff Fingers
- Wrist sprain
Circulation
- Cold Sensitive Fingers and Toes
Congenital
- Extra or Webbed Fingers
Fractures & Injuries
- Black Toenail
- Boxer's Fracture
- Broken Scaphoid Bone
- Dislocated Finger
- Hand and finger fractures
- Jammed Finger
- Severed Finger
- Torn Thumb Ligament
- Wrist Cartilage Tear
- Wrist fracture
Infections
- Infected Finger
Injuries
- Boxer's Knuckle
- Crushed Hand Injury
- Foreign Object in Hand
- Hand Compartment Syndrome
- Jersey Finger
- Sprained Finger
Lumps & Bumps
- Bone Tumor in Hand
- Finger Cyst
Lumps & Masses
- Ganglion Cyst In Hand Or Wrist
- Hand Lump
Nails
- Nail Bed Injury
Nerves
- Carpal tunnel
- Cubital tunnel syndrome
- Cut Nerve in Hand
- Hand Neuroma
- Hand Numbness and Tingling
- Hand Weakness
- Pinched Nerve in Wrist
- Wrist Drop
Tendons
- De Quervain tenosynovitis
- Dupuytren's contracture
- Golfer's elbow
- Intersection Syndrome
- Mallet Finger
- Swan Neck Deformity
- Tennis elbow
- Torn Hand Tendon
- Trigger finger
Procedures & services
Bone surgery
- Ulnar Shortening Surgery
Cyst & Lump Removal
- Ganglion Cyst Removal
- Removal of a soft-tissue mass
Fracture Repair
- Boxer's Fracture Fixation
- Broken Finger Surgery
- Scaphoid Fracture Surgery
- Wrist fracture fixation
Injections
- Cortisone Shot for Finger
- Cortisone Shot for Wrist
- Xiaflex Injection for Dupuytren's
Injections & Therapy
- Custom Hand Splinting
- Hand therapy
- Mallet Finger Splinting
- PRP Shot for Wrist or Elbow
- Tendon Sheath Injection
Joint surgery
- Finger Bone Spur Removal
- Thumb Base Joint Replacement
Joint Surgery
- Finger Joint Fusion
- Finger Joint Replacement
- Thumb Arthritis Surgery
- Thumb Ligament Repair
- Wrist Arthroscopy
- Wrist Cartilage Repair
- Wrist Fusion
Minor procedures
- Finger Dislocation Reset
- Foreign Object Removal from Hand
Nail procedures
- Blood Under Toenail Drainage
- Nail Bed Repair
Nerve Surgery
- Carpal tunnel surgery
- Cubital tunnel decompression
- Nerve Repair Surgery
Nerve surgery
- Hand Neuroma Surgery
- Minimally Invasive Carpal Tunnel Release
Pain management
- Wrist Denervation Surgery
Tendon Surgery
- Dupuytren contracture surgery
- Tendon Repair Surgery
- Tendon Transfer Surgery
- Tennis Elbow Surgery
- Thumb Tendon Release
- Trigger finger release
Tendon surgery
- Jersey Finger Repair
- Tendon Scar Tissue Release
Trauma & Reconstruction
- Drainage of Finger Infection
- Extra Finger Removal
- Fingertip Reconstruction
- Severed Finger Reattachment
- Webbed Finger Separation
Wound repair
- Skin Graft for Hand Wound
Procedures Most Often Billed to Medicare
736 services · 425 patients · 13 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Incision of tendon covering of finger | Procedure | 26055 |
42 | More often than most peers in Orthopaedic Hand Surgery |
| Release and/or relocation of hand nerve | Procedure | 64721 |
30 | As often as other peers in Orthopaedic Hand Surgery |
| Aspiration and/or injection of fluid from small joint | Procedure | 20600 |
24 | |
| Injection into tendon or ligament | Procedure | 20550 |
14 | |
| X-ray of hand, minimum of 3 views | Imaging | 73130 |
94 | As often as other peers in Orthopaedic Hand Surgery |
| X-ray of wrist, minimum of 3 views | Imaging | 73110 |
73 | As often as other peers in Orthopaedic Hand Surgery |
| X-ray of finger, minimum of 2 views | Imaging | 73140 |
66 | More often than most peers in Orthopaedic Hand Surgery |
| X-ray of elbow, minimum of 3 views | Imaging | 73080 |
23 | As often as other peers in Orthopaedic Hand Surgery |
| Injection, dexamethasone sodium phosphate, 1 mg | Drug given | J1100 |
207 | As often as other peers in Orthopaedic Hand Surgery |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
79 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other orthopaedic hand surgeons in Amherst 5
Same specialty, same city.
Trained at State University of Ny Upstate Medical University 8
Other providers in the same specialty who trained at the same institution.
More connections — 16 related providers in 2 groups
Class of 1987 at State University of Ny Upstate Medical University 8
Providers who graduated from the same medical school in the same year.
Also performs Incision of tendon covering of finger 8
Providers in NY who bill this service to Medicare most often.
Common questions
What does Dr. Callahan specialize in?
Dr. Callahan is an orthopaedic hand surgeon in Amherst, NY. That is the designation recorded for this NPI in the federal registry, where it is listed as “Orthopaedic Hand Surgery”.
NPI registry
Where is Dr. Callahan located?
Dr. Callahan is listed at 3925 Sheridan Drive Suite 100, Amherst, NY 14226. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Callahan's phone number?
The number on file is (716) 250-9999. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Callahan's NPI number?
Dr. Callahan's National Provider Identifier is 1952338048. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Callahan go to medical school?
Dr. Callahan attended State University of Ny Upstate Medical University, graduating in 1987. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Callahan been practicing?
Dr. Callahan has 39 years experience. Calculated from a graduation year of 1987, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Callahan do most often?
According to Medicare billing data, Dr. Callahan performs procedures including incision of tendon covering of finger, release and/or relocation of hand nerve and aspiration and/or injection of fluid from small joint; reads or performs imaging such as x-ray of hand, minimum of 3 views and x-ray of wrist, minimum of 3 views, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Callahan confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Callahan. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.