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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

MARIAH HAMILTON PA-C
NPI 1104393891
Physician Assistant in Greenfield, MA

Active since October 31, 2018PECOS Enrolled
329 CONWAY ST, GREENFIELD, MA 01301(413) 774-6301(866) 644-0871 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Jul 13, 2026, Apr 29, 2026, Feb 13, 2019 and 1 more (4 updates tracked since 2018).

About Mariah Hamilton Pa-c NPPES

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

MARIAH HAMILTON PA-C (NPI 1104393891) is an individual physician assistant in Greenfield, Massachusetts, licensed in Massachusetts (PA6829) and active in the NPI registry since October 2018. She is enrolled in Medicare PECOS and maintains 4 additional practice locations.

NPPES Registry Identity

NPI1104393891
Entity TypeIndividualFemale
Primary Taxonomy363A00000X
Provider Legal NameMARIAH HAMILTONCredential: PA-C
Location Address329 CONWAY STGreenfield, MA 01301-1521
Mailing Address329 Conway StGreenfield, MA 01301-1521 · (413) 774-6301 · Fax (866) 644-0871
Phone(413) 774-6301
Fax(866) 644-0871
Sole ProprietorNo
Enumeration DateOctober 31, 2018
Last NPPES UpdateJuly 13, 20264 updates tracked since enumeration
NPPES CertifiedJuly 13, 2026
✔ NPI 1104393891 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPhysician AssistantPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363A00000X
License✔ Licensed in MA · PA6829
Definition
A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.
329 CONWAY ST, Greenfield, MA 01301
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Secondary Practice Locations 4

Location 170 Main StFlorence, MA 01062-1466 · Phone (413) 586-8400 · Fax (866) 644-0872
Location 2329 Conway StGreenfield, MA 01301-1521 · Phone (413) 774-6301 · Fax (866) 644-0871
Location 331 Hall DrAmherst, MA 01002-2751 · Phone (413) 256-8561 · Fax (866) 644-0869
Location 4238 Northampton StEasthampton, MA 01027-1046 · Phone (413) 529-9300 · Fax (866) 644-0870

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Mariah Hamilton Pa-c is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 01301 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$90.70 typical visit price
range $58.86 – $177.36
Typical copayment $22.67 (range $14.71 – $44.34)
Most-billed visit code 99203
Established Patient
$73.22 typical visit price
range $19.11 – $144.84
Typical copayment $18.30 (range $4.77 – $36.21)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Referred Medical Equipment & Supplies CMS DME claims 2

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Portable gaseous oxygen system, rental; includes portable container, regulator, flowmeter, humidifier, cannula or mask, and tubing E0431
DME-Oxygen and Supplies · category DC000N
1 supplier11 claims11 services$14.06 avg. paid by Medicare
Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate E1390
DME-Oxygen and Supplies · category DC002N
1 supplier11 claims11 services$62.67 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

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.

MASSACHUSETTS SOCIETY FOR THE PREVENTION OF CRUELTY TO CHILDREN
Social Worker (Clinical)
329 CONWAY ST, SUITE 2
GREENFIELD, MA 01301
Franklin County (413) 773-3608
VALLEY MEDICAL GROUP, P.C.
Durable Medical Equipment & Medical Supplies
329 CONWAY ST, GREENFIELD HEALTH CENTER
GREENFIELD, MA 01301
Franklin County (413) 774-6301
MARJORIE DALE SOBIL RD, LDN
Dietitian, Registered
329 CONWAY ST
GREENFIELD, MA 01301
Franklin County (413) 774-6301
MRS. BARBARA JEAN BERTHIAUME APRN
Nurse Practitioner (Family)
329 CONWAY ST
GREENFIELD, MA 01301
Franklin County (413) 774-6301
DR. PATRICIA A IVERSON M.D.
Family Medicine
329 CONWAY ST, VALLEY MEDICAL GROUP, PC-GREENFIELD HEALTH CENTER
GREENFIELD, MA 01301
Franklin County (413) 774-6301
DR. BARBARA ARNOLD MORRIS AU.D.
Audiologist
329 CONWAY ST, PIONEER HEARING SERVICES
GREENFIELD, MA 01301
Franklin County (413) 773-5119
MRS. MARY-JO P CROWLEY-BOWDISH LICSW
Social Worker (Clinical)
329 CONWAY ST
GREENFIELD, MA 01301
Franklin County (413) 773-3608
MS. REBECCA L BUCALA PT
Physical Therapist
329 CONWAY ST, GREENFIELD HEALTH CENTER
GREENFIELD, MA 01301
Franklin County (413) 774-6301

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 Mariah Hamilton's NPI number?

The NPI number for Mariah Hamilton is 1104393891. It was assigned to this individual provider in the NPPES registry on October 31, 2018.

Where is Mariah Hamilton located?

Mariah Hamilton practices at 329 Conway St, Greenfield, MA 01301. The listed phone number is (413) 774-6301.

What is Mariah Hamilton's specialty?

The primary specialty registered for this NPI is Physician Assistant with taxonomy code 363A00000X.

Is Mariah Hamilton enrolled in Medicare?

Yes. Mariah Hamilton is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Mariah Hamilton was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 28 days 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.