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DR. PETER CHARLES WILLIAMS PH.D.
NPI 1609926609
Psychologist - Clinical in Newburyport, MA

Active since January 11, 2007Opted out of Medicare · through Jul 31, 2027
5 67TH ST, NEWBURYPORT, MA 01950(978) 465-3366(978) 499-9922 Get Directions Write a Review

NPPES record last updated: September 11, 2025. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Dr. Peter Charles Williams Ph.d. NPPES

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

DR. PETER CHARLES WILLIAMS PH.D. (NPI 1609926609) is an individual clinical provider in Newburyport, Massachusetts, licensed in Massachusetts (3525) and active in the NPI registry since January 2007. He has opted out of Medicare through July 31, 2027 and remains eligible to order and refer.

NPPES Registry Identity

NPI1609926609
Entity TypeIndividualMale
Primary Taxonomy103TC0700X
Provider Legal NameDR. PETER CHARLES WILLIAMSCredential: PH.D.
Location Address5 67TH STNewburyport, MA 01950-4444
Mailing AddressPo Box 1197Newburyport, MA 01950-6197 · (978) 465-3366 · Fax (978) 499-9922
Phone(978) 465-3366
Fax(978) 499-9922
Sole ProprietorYes
Enumeration DateJanuary 11, 2007
Last NPPES UpdateSeptember 11, 2025
✔ NPI 1609926609 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 4

★ Primary SpecialtyPsychologist · ClinicalBehavioral Health & Social Service Providers
Taxonomy Code103TC0700X
License✔ Licensed in MA · 3525
Definition
A psychologist who provides continuing and comprehensive mental and behavioral health care for individuals and families; consultation to agencies and communities; training, education and supervision; and research-based practice. It is a specialty in breadth -- one that is broadly inclusive of severe psychopathology -- and marked by comprehensiveness and integration of knowledge and skill from a broad array of disciplines within and outside of psychology proper. The scope of clinical psychology encompasses all ages, multiple diversities and varied systems.
Also ListedClinical NeuropsychologistTaxonomy 103G00000X · License 3525 (MA)
Also ListedPsychologistTaxonomy 103T00000X · License 3525 (MA)
Also ListedPsychologist · Clinical Child & AdolescentTaxonomy 103TC2200X · License 3525 (MA)
5 67TH ST, Newburyport, MA 01950
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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

ⓘ

Opted out of Medicare

Dr. Peter Charles Williams Ph.d. has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from July 31, 2017 through July 31, 2027.

Opt-Out Effective DateJuly 31, 2017
Opt-Out In Effect ThroughJuly 31, 2027Opt-out affidavits renew automatically every two years unless cancelled
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment– Home Health Agency– Power Mobility DevicesAn opted-out provider can still order and refer for Medicare patients in the categories marked above, even though their own services are not covered.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 01950 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
$177.36 typical visit price
range $58.86 – $177.36
Typical copayment $44.34 (range $14.71 – $44.34)
Most-billed visit code 99205
Established Patient
$103.48 typical visit price
range $19.11 – $144.84
Typical copayment $25.87 (range $4.77 – $36.21)
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 Peter Williams's NPI number?

The NPI number for Peter Williams is 1609926609. It was assigned to this individual provider in the NPPES registry on January 11, 2007.

Where is Peter Williams located?

Peter Williams practices at 5 67th St, Newburyport, MA 01950. The listed phone number is (978) 465-3366.

What is Peter Williams's specialty?

The primary specialty registered for this NPI is Psychologist, specializing in Clinical, with taxonomy code 103TC0700X.

Is Peter Williams enrolled in Medicare?

No. Peter Williams has opted out of Medicare through July 31, 2027. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

When was this NPI record last updated?

The NPPES record for Peter Williams 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 11 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.