DIANE KRISTINA WITMER LCSW
NPI 1033771225
Social Worker - Clinical in East Islip, NY
About Diane Kristina Witmer Lcsw NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DIANE KRISTINA WITMER LCSW (NPI 1033771225) is an individual clinical provider in East Islip, New York, licensed in Tennessee (7058) and active in the NPI registry since July 2019. She is enrolled in Medicare PECOS and is a graduate of Other (2010).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Diane Kristina Witmer Lcsw 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.
Medicare Billing Reassignments
3Medicare enrollment records show Diane Witmer reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
New Tazewell, TN 37825
- Reassigned Medicare billing, Tennessee enrollment
- 51 clinicians in this Medicare group
New Tazewell, TN 37825
- Reassigned Medicare billing, Tennessee enrollment
- 84 clinicians in this Medicare group
San Francisco, CA 94131
- Reassigned Medicare billing, Tennessee enrollment
- Medicare enrollment name: Brightside Medical PC
- 47 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 11730 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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 Diane Witmer's NPI number?
The NPI number for Diane Witmer is 1033771225. It was assigned to this individual provider in the NPPES registry on July 8, 2019.
Where is Diane Witmer located?
Diane Witmer practices at 56 Marilynn St, East Islip, NY 11730. The listed phone number is (631) 338-3913.
What is Diane Witmer's specialty?
The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.
Is Diane Witmer enrolled in Medicare?
Yes. Diane Witmer 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.
Which organizations bill Medicare for Diane Witmer's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Diane Witmer reassigns Medicare benefits to 3 organizations: Elite Urgent Care PLLC (New Tazewell, TN), Ultacare Medical PLLC (New Tazewell, TN) and Brightside Medical, P.C. (San Francisco, CA). 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 Diane Witmer's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Diane Witmer accept?
Health plans from Cigna Healthcare, Oscar Health, Oscar Insurance Company and UnitedHealthcare list Diane Witmer 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 Diane Witmer was last updated on September 15, 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.
# Diane Kristina Witmer, LCSW · NPI 1033771225
Clinical provider in East Islip, New York. Individual provider, active in the CMS NPPES registry since July 8, 2019.
## Identity
- **NPI:** 1033771225 (Entity type: Individual)
- **Enumerated:** July 8, 2019
- **Primary specialty:** Social Worker - Clinical · taxonomy 1041C0700X
- **State license:** 7058 (Tennessee)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 56 MARILYNN ST, East Islip, NY 11730-2703
- **Phone:** (631) 338-3913
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Elite Urgent Care PLLC (NPI 1447803390, New Tazewell, TN); Ultacare Medical PLLC (NPI 1225141492, New Tazewell, TN); Brightside Medical, P.C. (NPI 1801355482, San Francisco, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2010
## Record status
- **NPPES last updated:** September 15, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1033771225) · Data from the CMS NPPES public registry.