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DR. MASON WRIGHT FREEMAN MD
NPI 1851473821
Internal Medicine in Boston, MA

Active since October 19, 2006PECOS Enrolled
55 FRUIT STREET GRJ 1321, LIPID METABOLISM UNIT, BOSTON, MA 02114(617) 726-5906(617) 726-2879 Get Directions Write a Review

NPPES record last updated: September 11, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Dr. Mason Wright Freeman Md NPPES

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

DR. MASON WRIGHT FREEMAN MD (NPI 1851473821) is an individual internal medicine provider in Boston, Massachusetts, licensed in Massachusetts (47331) and active in the NPI registry since October 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1851473821
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. MASON WRIGHT FREEMANCredential: MD
Location Address55 FRUIT STREET GRJ 1321, LIPID METABOLISM UNITBoston, MA 02114-2696
Mailing AddressPo Box 9142, Mass General Physician OrganizationCharleston, MA 02129-9142 · (617) 724-0287 · Fax (617) 726-2894
Phone(617) 726-5906
Fax(617) 726-2879
Sole ProprietorNo
Enumeration DateOctober 19, 2006
Last NPPES UpdateSeptember 11, 2025
✔ NPI 1851473821 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in MA · 47331
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Also ListedInternal Medicine · Endocrinology, Diabetes & MetabolismTaxonomy 207RE0101X · License 47331 (MA)

Other Identifiers 3

OtherJ05377MA · Bc Bs Ma
Other047331MA · Tufts Health Plan
Medicaid3003663MA

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Mason Wright Freeman Md 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 02114 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
$144.11 typical visit price
range $63.72 – $189.86
Typical copayment $36.02 (range $15.93 – $47.46)
Most-billed visit code 99204
Established Patient
$111.18 typical visit price
range $21.07 – $155.29
Typical copayment $27.79 (range $5.26 – $38.82)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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 Mason Freeman's NPI number?

The NPI number for Mason Freeman is 1851473821. It was assigned to this individual provider in the NPPES registry on October 19, 2006.

Where is Mason Freeman located?

Mason Freeman practices at 55 Fruit Street Grj 1321 Lipid Metabolism Unit, Boston, MA 02114. The listed phone number is (617) 726-5906.

What is Mason Freeman's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Mason Freeman enrolled in Medicare?

Yes. Mason Freeman is registered in the Medicare PECOS enrollment system.

What insurance does Mason Freeman accept?

Health plans from Anthem Blue Cross and Blue Shield list Mason Freeman 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.

When was this NPI record last updated?

The NPPES record for Mason Freeman was last updated on September 11, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 months 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.