Doctor profile · Federal record
Dr. John McMahon, DO
Sports Medicine (Internal Medicine) Physician (CMS: Sports Medicine) · Sports Medicine (Internal Medicine) Physician · Portsmouth, NH
- NPI 1821258062
- Accepts Medicare
- MIPS 77.6 / 100 · 2023
- 18 yrs in practice
- Licensed in 2 states
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
1900 Lafayette RD, Suite A
Portsmouth, NH 038015679
(603) 431-1121
fax (603) 431-9147
Credentials & registration
- NPI registered
- June 2008 — 18 yrs on file
- Profile last updated
- February 23, 2017
- Year of graduation
- 2008 — 18 yrs since
- Specialty taxonomy
- 207RS0010X — NUCC code
- State licenses (2)
- New Hampshire #16235 · Maine #2237
- Medicaid
- NH #30228921
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1821258062. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
5,515
Distinct HCPCS
10
Medicare allowed
$190,077
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
J3304 |
Injection, triamcinolone acetonide, preservative-free, extended-release, microsphere formulation, 1 mg | 3,008 | 31 | $17 | |
J1030 |
Injection, methylprednisolone acetate, 40 mg | 1,107 | 543 | $8 | |
20611 |
Aspiration and/or injection of fluid large joint using ultrasound guidance | 703 | 452 | $108 | |
20604 |
Aspiration and/or injection of fluid from small joint using ultrasound guidance | 205 | 59 | $62 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 129 | 115 | $92 | |
20606 |
Aspiration and/or injection of fluid from medium joint using ultrasound guidance | 81 | 54 | $89 | |
99203 |
New patient office or other outpatient visit, 30-44 minutes | 56 | 56 | $114 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 47 | 44 | $130 | |
20610 |
Aspiration and/or injection of fluid from large joint | 37 | 32 | $40 | |
76942 |
Ultrasonic guidance for needle placement | 36 | 36 | $60 |
In context: peer comparison
Among 1 peers in Portsmouth Sports Medicine (Internal Medicine) Physician, average services per provider: 367. This provider delivers 15× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
62
Patients
38
Total drug cost
$249
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Prednisone | Generic | 27 | 25 | $109 |
| Tramadol Hcl | Generic | 21 | 13 | $80 |
| Meloxicam | Generic | 14 | 0 | $61 |
Frequently asked questions
What is Dr. John McMahon's medical specialty?
Dr. John McMahon practices Sports Medicine (Internal Medicine) Physician in Portsmouth, NH.
Where does Dr. John McMahon practice?
Dr. John McMahon practices at 1900 Lafayette RD, Portsmouth, NH 038015679. Office phone: 6034311121.
What is Dr. John McMahon's NPI?
Dr. John McMahon's National Provider Identifier (NPI) is 1821258062, issued by NPPES.
Does Dr. John McMahon accept Medicare assignment?
Yes. Dr. John McMahon accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. John McMahon commonly perform?
Top Medicare-reported procedures in 2023: Injection, triamcinolone acetonide, preservative-free, extended-release, microsphere formulation, 1 mg (HCPCS J3304); Injection, methylprednisolone acetate, 40 mg (HCPCS J1030); Aspiration and/or injection of fluid large joint using ultrasound guidance (HCPCS 20611). Source: CMS Medicare Physician & Other Practitioners file.