Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. Gregory Jay Chapman, DC

Individual provider Chiropractor · NPI 1366505737

Dr. Gregory Jay Chapman, DC is registered under Chiropractic in Missoula, Montana. Graduated from National College of Chiropractic in 1984, 42 years ago. Accepts Medicare assignment. Licensed in Montana.

Years since qualifying
42
Trained at
National College of Chiropractic
Licensed in
MT
In the registry since
2006
What do these letters mean?
DC — Doctor of Chiropractic
A licensed chiropractor.

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Practice location Address checks out

1526 S Reserve St
Missoula, MT 59801-4756 Not confirmed with CMS for 18 years — call before visiting
Phone: (406) 721-5780
Fax: (406) 721-6487
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Chiropractor (primary) Taxonomy 111N00000X · Licence 0514 (MT)

Record details

NPI number1366505737
Entity typeIndividual (Type 1)
GenderMale
Credentials DC
Sole proprietorNo
NPI enumeratedDecember 18, 2006
Last updated in NPPESNovember 26, 2007

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCHIROPRACTIC
Medical schoolNATIONAL COLLEGE OF CHIROPRACTIC
Graduated 1984 (42 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients18
Services billed 245 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

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