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

DR. MARK ALAN BLAIS PHD
NPI 1871583047
Psychologist in Boston, MA

Active since October 27, 2005PECOS EnrolledAccepts Medicare Assignment
55 FRUIT ST, WRN 1227, BOSTON, MA 02114(617) 724-9143(617) 724-9150 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Dr. Mark Alan Blais Phd NPPES

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

DR. MARK ALAN BLAIS PHD (NPI 1871583047) is an individual psychologist in Boston, Massachusetts, licensed in Massachusetts (6201) and active in the NPI registry since October 2005. He is enrolled in Medicare PECOS and is a graduate of Other (1990).

NPPES Registry Identity

NPI1871583047
Entity TypeIndividualMale
Primary Taxonomy103T00000X
Provider Legal NameDR. MARK ALAN BLAISCredential: PHD
Location Address55 FRUIT ST, WRN 1227Boston, MA 02114-2696
Mailing AddressPo Box 9142Charlestown, MA 02129-9142 · (617) 724-0287 · Fax (617) 726-2894
Fax(617) 724-9150
Sole ProprietorNo
Medical School CMSOtherGraduated 1990
Enumeration DateOctober 27, 2005
Last NPPES UpdateJuly 13, 2026
NPI 1871583047 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

Primary SpecialtyPsychologistBehavioral Health & Social Service Providers
Taxonomy Code103T00000X
License Licensed in MA · 6201
Definition
A psychologist is an individual who is licensed to practice psychology which is defined as the observation, description, evaluation, interpretation, and modification of human behavior by the application of psychological principles, methods, and procedures, for the purpose of preventing or eliminating symptomatic, maladaptive, or undesired behavior and of enhancing interpersonal relationships, work and life adjustment, personal effectiveness, behavioral health, and mental health. The practice of psychology includes, but is not limited to, psychological testing and the evaluation or assessment of personal characteristics, such as intelligence, personality, abilities, interests, aptitudes, and neuropsychological functioning; counseling, psychoanalysis, psychotherapy, hypnosis, biofeedback, and behavior analysis and therapy; diagnosis and treatment of mental and emotional disorder or disability, alcoholism and substance abuse, disorders of habit or conduct, as well as of the psychological aspects of physical illness, accident, injury, or disability; and psycheducational evaluation, therapy, remediation, and consultation. Psychological services may be rendered to individuals, families, groups and the public.
55 FRUIT ST, Boston, MA 02114

Other Identifiers 3

Medicaid0522198MA
Other723413MA · Tufts Health Plan
OtherW05000MA · Bcbs Ma

Accepted Insurance

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

Enrolled in Medicare and accepts Medicare assignment

Dr. Mark Alan Blais Phd 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 ID5597958793
PECOS Enrollment IDI20101020000926
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.

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.

Pathology (Anatomic Pathology)
55 FRUIT ST
BOSTON, MA 02114
Internal Medicine (Hematology & Oncology)
55 FRUIT ST
BOSTON, MA 02114
Anesthesiology
55 FRUIT ST, GRAY-BIGELOW 444
BOSTON, MA 02114
Physical Medicine & Rehabilitation
55 FRUIT ST
BOSTON, MA 02114
Internal Medicine (Infectious Disease)
55 FRUIT ST, DIVISION OF INFECTIOUS DISEASE, GRJ-504
BOSTON, MA 02114
Nurse Practitioner (Acute Care)
55 FRUIT ST, BIGALOW 852 F
BOSTON, MA 02114
Nurse Practitioner
55 FRUIT ST
BOSTON, MA 02114
Internal Medicine (Cardiovascular Disease)
55 FRUIT ST
BOSTON, MA 02114

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 Mark Blais's NPI number?

The NPI number for Mark Blais is 1871583047. It was assigned to this individual provider in the NPPES registry on October 27, 2005.

Where is Mark Blais located?

Mark Blais practices at 55 Fruit St Wrn 1227, Boston, MA 02114. The listed phone number is (617) 724-9143.

What is Mark Blais's specialty?

The primary specialty registered for this NPI is Psychologist with taxonomy code 103T00000X.

Is Mark Blais enrolled in Medicare?

Yes. Mark Blais 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.

What insurance does Mark Blais accept?

Health plans from Anthem Blue Cross and Blue Shield and Harvard Pilgrim Health Care list Mark Blais 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 Mark Blais 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 38 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.