1. Home
  2. Directory
  3. Massachusetts
  4. Boston
  5. Psychologist
  6. NPI Profile

DR. HILLARY LEE DITMARS PHD
NPI 1326784612
Psychologist - Clinical in Boston, MA

Active since May 09, 2022PECOS Enrolled
55 FRUIT ST STE 6A, BOSTON, MA 02114(617) 724-5600(617) 726-5567 Get Directions Write a Review

NPPES record last updated: June 24, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jun 24, 2025, Jul 11, 2022, May 9, 2022 (3 updates tracked since 2022).

About Dr. Hillary Lee Ditmars Phd NPPES

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

DR. HILLARY LEE DITMARS PHD (NPI 1326784612) is an individual clinical provider in Boston, Massachusetts, licensed in Massachusetts (PSY10001049) and active in the NPI registry since May 2022. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1326784612
Entity TypeIndividualFemale
Primary Taxonomy103TC0700X
Provider Legal NameDR. HILLARY LEE DITMARSCredential: PHD
Location Address55 FRUIT ST STE 6ABoston, MA 02114-2696
Mailing Address55 Fruit St Ste 6aBoston, MA 02114-2621
Phone(617) 724-5600
Fax(617) 726-5567
Sole ProprietorNo
Enumeration DateMay 9, 2022
Last NPPES UpdateJune 24, 20253 updates tracked since enumeration
NPPES CertifiedJune 24, 2025
✔ NPI 1326784612 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychologist · ClinicalBehavioral Health & Social Service Providers
Taxonomy Code103TC0700X
License✔ Licensed in MA · PSY10001049
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.
55 FRUIT ST STE 6A, Boston, MA 02114
Open in Google Maps ↗

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Harvard Pilgrim Health Care, Taro Health.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Hillary Lee Ditmars Phd 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.

Medicare Billing Reassignments

2

Medicare enrollment records show Hillary Ditmars reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Massachusetts General Physicians Organization Inc
Same address
Dermatology
55 FRUIT ST, BUL 2
Boston, MA 02114
  • Reassigned Medicare billing, Massachusetts enrollment
  • 6,360 clinicians in this Medicare group
NPI 1801874573 (617) 724-0287
The General Hospital Corporation
Same address
General Acute Care Hospital
55 FRUIT ST, BULFINCH 360
Boston, MA 02114
  • Reassigned Medicare billing, Massachusetts enrollment
  • 6,234 clinicians in this Medicare group
NPI 1023049236 (617) 726-2000

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

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
$189.86 typical visit price
range $63.72 – $189.86
Typical copayment $47.46 (range $15.93 – $47.46)
Most-billed visit code 99205
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.

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. FATMA OZLEM HOKELEKLI MD, PHD
Student in an Organized Health Care Education/Training Program
55 FRUIT ST STE 6A
BOSTON, MA 02114
Suffolk County (617) 726-1620

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 Hillary Ditmars's NPI number?

The NPI number for Hillary Ditmars is 1326784612. It was assigned to this individual provider in the NPPES registry on May 9, 2022.

Where is Hillary Ditmars located?

Hillary Ditmars practices at 55 Fruit St Ste 6A, Boston, MA 02114. The listed phone number is (617) 724-5600.

What is Hillary Ditmars's specialty?

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

Is Hillary Ditmars enrolled in Medicare?

Yes. Hillary Ditmars is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Hillary Ditmars's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Hillary Ditmars reassigns Medicare benefits to 2 organizations: Massachusetts General Physicians Organization Inc (Boston, MA) and The General Hospital Corporation (Boston, MA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Hillary Ditmars's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Hillary Ditmars accept?

Health plans from Harvard Pilgrim Health Care and Taro Health list Hillary Ditmars 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 Hillary Ditmars was last updated on June 24, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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.