Physician Profile
Unclaimed ProfileAbout MCMAHON
John Andrew McMahon, DO practices sports medicine in Portsmouth, NH. John is a 2008 graduate of University of New England, College of Osteo Medicine. John is also listed as specializing in internal medicine. According to Medicare claims data, John cared for 1,725 Medicare patients across 46,268 services.
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
Areas of Expertise
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (603) 431-1121
- Email not available
Practice Locations
1900 LAFAYETTE RD SUITE A
Portsmouth, NH 03801
Procedures Most Often Billed to Medicare
46,268 services · 1,725 patients · 18 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Aspiration and/or injection of fluid large joint using ultrasound guidance | Procedure | 20611 |
700 |
| Aspiration and/or injection of fluid from small joint using ultrasound guidance | Procedure | 20604 |
205 |
| Aspiration and/or injection of fluid from medium joint using ultrasound guidance | Procedure | 20606 |
64 |
| Aspiration and/or injection of fluid from large joint | Procedure | 20610 |
33 |
| Injection into tendon or ligament | Procedure | 20550 |
32 |
| Injection of contrast for imaging of shoulder joint | Procedure | 23350 |
25 |
| Injection of anesthetic and/or steroid drug into foot nerve | Procedure | 64455 |
21 |
| Ultrasonic guidance for needle placement | Imaging | 76942 |
54 |
| Limited ultrasound scan of joint or other extremity structure except blood vessels | Imaging | 76882 |
24 |
| X-ray of knee, 3 views | Imaging | 73562 |
18 |
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.
Related specialists at this location 8
Clinically related specialties at the same address — the people this provider most likely works alongside.
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.
More connections — 24 related providers in 3 groups
Trained at University of New England, College of Osteo Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 2008 at University of New England, College of Osteo Medicine 8
Providers who graduated from the same medical school in the same year.
Also performs Aspiration and/or injection of fluid large joint using ultrasound guidance 8
Providers in NH who bill this service to Medicare most often.
Common questions
What kind of doctor is Dr. McMahon?
Dr. McMahon is a sports medicine in Portsmouth, NH. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “SPORTS MEDICINE”.
NPI registry
What is Dr. McMahon's address?
Dr. McMahon is listed at 1900 LAFAYETTE RD SUITE A, Portsmouth, NH 03801. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Dr. McMahon?
The number on file is (603) 431-1121. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. McMahon's NPI number?
Dr. McMahon's National Provider Identifier is 1821258062. 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. McMahon train?
Dr. McMahon attended University of New England, College of Osteo Medicine, graduating in 2008. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. McMahon been practicing?
Dr. McMahon has 18 years experience. Calculated from a graduation year of 2008, reported in the CMS National Downloadable File.
CMS public data
What procedures does Dr. McMahon perform?
According to Medicare billing data, Dr. McMahon performs procedures including aspiration and/or injection of fluid large joint using ultrasound guidance, aspiration and/or injection of fluid from small joint using ultrasound guidance and aspiration and/or injection of fluid from medium joint using ultrasound guidance; reads or performs imaging such as ultrasonic guidance for needle placement and limited ultrasound scan of joint or other extremity structure except blood vessels, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. McMahon confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. McMahon. If this is you, claiming it is free.
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Claim this profileProvider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.