JOHN ANDREW MCMAHON DO
NPI 1821258062
Internal Medicine - Sports Medicine in Portsmouth, NH

Q: What is John Mcmahon's NPI number?

The NPI number for John Mcmahon is 1821258062. It was assigned to this individual provider in the NPPES registry on June 11, 2008.

Q: What is John Mcmahon's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Sports Medicine, with taxonomy code 207RS0010X.

Q: When was this NPI record last updated?

The NPPES record for John Mcmahon was last updated on February 23, 2017. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since June 11, 2008PECOS EnrolledAccepts Medicare Assignment

77.63/100

CMS Quality Rating

1900 LAFAYETTE RD, SUITE A, PORTSMOUTH, NH 03801(603) 431-1121(603) 431-9147 Get Directions Write a Review

NPPES record last updated: February 23, 2017. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Feb 23, 2017, Mar 4, 2016 (2 updates tracked since 2016).

On this page

About John Andrew Mcmahon Do NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

JOHN ANDREW MCMAHON DO (NPI 1821258062) is an individual sports medicine provider in Portsmouth, New Hampshire, licensed in New Hampshire (16235) and active in the NPI registry since June 2008. He is enrolled in Medicare PECOS, is affiliated with York Hospital, and is a graduate of University Of New England, College Of Osteo Medicine (2008).

NPPES Registry Identity

NPI1821258062

Entity TypeIndividualMale

Primary Taxonomy207RS0010X

Provider Legal NameJOHN ANDREW MCMAHONCredential: DO

Location Address1900 LAFAYETTE RD, SUITE APortsmouth, NH 03801-5679

Mailing Address1900 Lafayette Rd, Suite APortsmouth, NH 03801-5679 · (603) 431-1121 · Fax (603) 431-9147

Phone(603) 431-1121

Fax(603) 431-9147

Sole ProprietorNo

Medical School CMSUniversity Of New England, College Of Osteo MedicineGraduated 2008

Enumeration DateJune 11, 2008

Last NPPES UpdateFebruary 23, 20172 updates tracked since enumeration

✔ NPI 1821258062 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Sports MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207RS0010X

Licenses✔ Licensed in NH · 16235✔ Licensed in ME · 2237

Definition

An internist trained to be responsible for continuous care in the field of sports medicine, not only for the enhancement of health and fitness, but also for the prevention of injury and illness. A sports medicine physician must have knowledge and experience in the promotion of wellness and the prevention of injury. Knowledge about special areas of medicine such as exercise physiology, biomechanics, nutrition, psychology, physical rehabilitation, epidemiology, physical evaluation, injuries (treatment and prevention and referral practice) and the role of exercise in promoting a healthy lifestyle are essential to the practice of sports medicine. The sports medicine physician requires special education to provide the knowledge to improve the healthcare of the individual.

1900 LAFAYETTE RD, Portsmouth, NH 03801

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Other Identifiers 4

Medicare PINP01073693ME

Medicaid30228921NH

Medicare PIN002235002ME

Medicare PIN002235001ME

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from NH Healthy Families, Anthem Blue Cross and Blue Shield, Harvard Pilgrim Health Care and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

John Andrew Mcmahon Do is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID3678742996

PECOS Enrollment IDI20110803000147, I20130821000514

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show John Mcmahon reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Sportsmedicine Atlantic Orthopaedics PA

0.2 mi

Specialist

1900 LAFAYETTE RD, STE A
Portsmouth, NH 03801

Reassigned Medicare billing, Maine and New Hampshire enrollments
14 clinicians in this Medicare group

NPI 1881631554 (603) 431-1121

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 17

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Injection, triamcinolone acetonide, preservative-free, extended-release, microsphere formulation, 1 mg J3304

Triamcinolone acetonide is a long-lasting, preservative-free steroid injection. It's delivered in tiny, slow-releasing particles (microspheres) to manage inflammation or related conditions. The dose given is 1 mg. It's generally safe with few side effects.

3,488 services38 patients

Aspiration and/or injection of fluid large joint using ultrasound guidance 20611

This procedure involves using ultrasound technology to accurately locate a large joint, usually the knee or shoulder. A needle is then inserted to either extract fluid (aspiration) or inject medication. The ultrasound helps ensure precision and safety.

700 services441 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

339 services252 patients

Injection, methylprednisolone acetate, 40 mg J1030

Methylprednisolone acetate is a medication given through an injection. It's a type of corticosteroid, which reduces inflammation and immune responses. It can be used to treat various conditions like arthritis, allergies, and skin diseases. This dose is 40 mg.

253 services164 patients

Aspiration and/or injection of fluid from small joint using ultrasound guidance 20604

This procedure involves using ultrasound to accurately locate a small joint. A needle is then carefully inserted to remove fluid (aspiration) or inject medication. This can help diagnose or treat joint issues. It's generally safe and minimally invasive.

205 services55 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

105 services98 patients

Aspiration and/or injection of fluid from medium joint using ultrasound guidance 20606

This is a procedure where a needle is guided by ultrasound into a medium-sized joint, like a knee or shoulder. The needle can be used to remove fluid, which can relieve pressure and pain, or to inject medication to help with inflammation and discomfort.

64 services41 patients

Ultrasonic guidance for needle placement 76942

Ultrasonic guidance for needle placement is a technique where sound waves create images that help accurately position the needle during procedures. This method ensures precision, minimizes discomfort, and increases safety.

54 services53 patients

Aspiration and/or injection of fluid from large joint 20610

This procedure involves using a needle to remove (aspiration) or introduce (injection) fluid into a large joint like the knee or hip. It can help diagnose conditions, relieve discomfort, or deliver medication directly to the joint.

33 services28 patients

Injection into tendon or ligament 20550

An injection into a tendon or ligament involves placing medication directly into these areas to help reduce inflammation and pain. It's often used for conditions like arthritis or tendonitis. The procedure is quick and usually involves a local anesthetic.

32 services24 patients

Injection of contrast for imaging of shoulder joint 23350

This procedure involves injecting a contrast agent into your shoulder joint. The contrast helps highlight the joint on an imaging scan, giving a clearer picture of its condition. It can help identify any abnormalities or injuries. It's generally safe with minimal discomfort.

25 services25 patients

Limited ultrasound scan of joint or other extremity structure except blood vessels 76882

A limited ultrasound scan of a joint or other extremity structure lacking blood vessels is a non-invasive procedure that uses sound waves to create images of the inside of your body. This helps in diagnosing and monitoring conditions related to your joints or other similar structures.

24 services20 patients

Injection of anesthetic and/or steroid drug into foot nerve 64455

This procedure involves injecting a combination of anesthetic and/or steroid medication into a nerve in your foot. It's designed to alleviate pain and inflammation. You may experience temporary numbness or relief in the treated area.

21 services14 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

21 services21 patients

X-ray of knee, 3 views 73562

An X-ray of the knee, 3 views, is a non-invasive imaging test. It uses a small amount of radiation to produce images of the knee from three different angles. This helps medical professionals to diagnose and monitor conditions like arthritis, fractures, or infections. The process is quick and painless.

18 services16 patients

X-ray of shoulder, minimum of 2 views 73030

An X-ray of the shoulder, with a minimum of 2 views, is a non-invasive imaging test. It uses a small amount of radiation to produce images of your shoulder bones. This helps in diagnosing conditions like fractures, arthritis, or other abnormalities. The procedure is quick and painless.

16 services15 patients

New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203

This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.

15 services15 patients

Hospital Affiliations CMS Care Compare 2

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

York Hospital

Acute Care Hospitals · York, ME

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number200020

Location15 Hospital DriveYork, ME 03909 · York County

Emergency services Birthing friendly

Portsmouth Regional Hospital

Acute Care Hospitals · Portsmouth, NH

3/5 CMS rating

OwnershipProprietary

CMS Certification Number300029

Location333 Borthwick AvePortsmouth, NH 03801 · Rockingham County

Emergency services Birthing friendly

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

77.63/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Individually scored

Promoting Interoperability

100

Improvement Activities

Cost

25.43

Reported Quality Measures

e-Prescribing

97%201 patients4/55-star benchmark: 100%

Provide Patients Electronic Access to Their Health Information

100%2,302 patients5/55-star benchmark: 100%

Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MEGAN E SPURLING PA-C

Physician Assistant

1900 LAFAYETTE RD, STE A
PORTSMOUTH, NH 03801

Rockingham County (603) 431-1121

SHIELDS IMAGING OF PORTSMOUTH LLC

Clinic/Center (Magnetic Resonance Imaging (MRI))

1900 LAFAYETTE RD, SUITE B
PORTSMOUTH, NH 03801

Rockingham County (800) 258-4674

MR. BRIAN DENNIS BARRY PAC

Orthopaedic Surgery

1900 LAFAYETTE RD, SUITE A
PORTSMOUTH, NH 03801

Rockingham County (603) 431-1121

CHRISTINA M SCARDINA PA-C

Physician Assistant (Surgical)

1900 LAFAYETTE RD, SUITE A
PORTSMOUTH, NH 03801

Rockingham County (603) 431-1122

RYAN LABELLE

Orthopaedic Surgery

1900 LAFAYETTE RD
PORTSMOUTH, NH 03801

Rockingham County (603) 431-1121

MR. BARRY CHRISTOPHER CUSSON PA

Orthopaedic Surgery

1900 LAFAYETTE RD, SUITE A
PORTSMOUTH, NH 03801

Rockingham County (603) 431-1121

HILARY L STORNELLI PT

Physical Therapist

1900 LAFAYETTE RD, STE C
PORTSMOUTH, NH 03801

Rockingham County (603) 431-5610

DR. AKHILESH SASTRY MD

Orthopaedic Surgery

1900 LAFAYETTE RD, SUITE A
PORTSMOUTH, NH 03801

Rockingham County (603) 431-1121

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is John Mcmahon's NPI number?

The NPI number for John Mcmahon is 1821258062. It was assigned to this individual provider in the NPPES registry on June 11, 2008.

Where is John Mcmahon located?

John Mcmahon practices at 1900 Lafayette Rd Suite A, Portsmouth, NH 03801. The listed phone number is (603) 431-1121.

What is John Mcmahon's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Sports Medicine, with taxonomy code 207RS0010X.

Is John Mcmahon enrolled in Medicare?

Yes. John Mcmahon is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for John Mcmahon's services?

According to the CMS Revalidation Reassignment List (October 2026 release), John Mcmahon reassigns Medicare benefits to Sportsmedicine Atlantic Orthopaedics PA (Portsmouth, NH). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for John Mcmahon's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does John Mcmahon accept?

Health plans from Ambetter from NH Healthy Families, Anthem Blue Cross and Blue Shield, Harvard Pilgrim Health Care, Taro Health and WellSense Health Plan list John Mcmahon as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is John Mcmahon affiliated with any hospitals?

According to CMS data, John Mcmahon is affiliated with York Hospital and Portsmouth Regional Hospital.

When was this NPI record last updated?

The NPPES record for John Mcmahon was last updated on February 23, 2017. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.