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

Dr. Glen Robert Mark, DC

Individual provider Chiropractor · NPI 1669415238

Dr. Glen Robert Mark, DC is registered under Chiropractic in Riverhead, New York. Graduated from Life Chiropractic College in 1993, 33 years ago. Practices with Hallmark Chiropractic, a 2-clinician group and accepts Medicare assignment. Licensed in New York.

Years since qualifying
33
Trained at
Life Chiropractic College
Licensed in
NY
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

633 Roanoke Ave
Riverhead, NY 11901-2727
Phone: (631) 727-3795
Fax: (631) 727-1961
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Chiropractor (primary) Taxonomy 111N00000X · Licence XOO7337-1 (NY)

Record details

NPI number1669415238
Entity typeIndividual (Type 1)
GenderMale
Credentials DC
Sole proprietorNo
NPI enumeratedJune 13, 2006
Last updated in NPPESMarch 10, 2020
Certification dateMarch 10, 2020

Medicare enrollment

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

Medicare specialtyCHIROPRACTIC
Medical schoolLIFE CHIROPRACTIC COLLEGE
Graduated 1993 (33 years in practice)
Group practice Hallmark Chiropractic — 2 clinicians
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 patients78
Services billed 976 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

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.

Colleagues at Hallmark Chiropractic

Clinicians the CMS Doctors & Clinicians file lists under the same group practice.

Other providers in Riverhead