What is Diane Witmer's NPI number?

Diane Witmer's National Provider Identifier (NPI) is 1033771225, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Diane Witmer's specialty?

Diane Witmer is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).

Where is Diane Witmer located?

Diane Witmer's practice location on file with NPPES is 56 Marilynn St, East Islip, NY 11730-2703.

What is Diane Witmer's phone number?

The practice phone number listed in the NPPES registry for Diane Witmer is (631) 338-3913.

Does Diane Witmer accept Medicare?

Diane Witmer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.

Is Diane Witmer's NPI active?

Yes — Diane Witmer's NPI (1033771225) is active in the NPPES registry as of the last update on 2023-11-27.

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Diane Witmer, LCSW

NPI 1033771225 · Clinical Social Worker · East Islip, NY

Diane Witmer, LCSW is a Clinical Social Worker provider in East Islip, NY (NPI 1033771225).

Provider details

NPI number: 1033771225
Entity type: Individual
Primary specialty: Clinical Social WorkerBehavioral Health & Social Service Providers
Credential: LCSW
Sex: Female
Sole proprietor: Yes
License: 088174 (NY)

Practice location

56 Marilynn St

East Islip, NY 11730-2703

Phone: (631) 338-3913

Street-level locationGet directions

More NY providers

Mailing address

56 Marilynn St

East Islip, NY 11730-2703

Specialties & taxonomies

Clinical Social WorkerPrimary1041C0700XLicense 7058 (TN)
Behavioral Health & Social Service Providers
Clinical Social Worker1041C0700XLicense 088174 (NY)
Behavioral Health & Social Service Providers
Clinical Social Worker1041C0700XLicense 0904011127 (VA)
Behavioral Health & Social Service Providers

Enrolled with Medicare as Practitioner - Clinical Social Worker · source: CMS PECOS Public Provider Enrollment (2026.04.01)

Profile Score

Established profile(51/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure28% of score
7 yrs in NPPES registry
Profile completeness28% of score
100% of core fields populated
Practice footprint17% of score
1 documented practice location
Medicare service volume (vs. specialty peers)28% of score
66 Medicare services, 2024 (ranked within specialty)

Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.

What this provider does (Medicare)

Based on Medicare fee-for-service claims, 2024; not all care is captured.

Service (HCPCS)	Medicare services	Typical Medicare-allowed (2024)
Psychotherapy, 30 Minutes90832	66	$56

Typical Medicare-allowed amounts for these services range $56–$56 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.

Enumerated: 2019-07-08
Last updated: 2023-11-27

Frequently asked questions

What is Diane Witmer's NPI number?: Diane Witmer's National Provider Identifier (NPI) is 1033771225, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
What is Diane Witmer's specialty?: Diane Witmer is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
Where is Diane Witmer located?: Diane Witmer's practice location on file with NPPES is 56 Marilynn St, East Islip, NY 11730-2703.
What is Diane Witmer's phone number?: The practice phone number listed in the NPPES registry for Diane Witmer is (631) 338-3913.
Does Diane Witmer accept Medicare?: Diane Witmer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
Is Diane Witmer's NPI active?: Yes — Diane Witmer's NPI (1033771225) is active in the NPPES registry as of the last update on 2023-11-27.

Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.

Provider details

Practice location

Mailing address

Specialties & taxonomies

Profile Score

What this provider does (Medicare)

Registry dates

Frequently asked questions

Specialties & taxonomies

Frequently asked questions

Profile Score

What this provider does (Medicare)