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DR. WILLIAM SIDELINGER MD
NPI 1467071209
Psychiatry & Neurology - Child & Adolescent Psychiatry in Worcester, MA

Active since April 12, 2020PECOS Enrolled
309 BELMONT ST, WORCESTER, MA 01604(508) 368-3300 Get Directions Write a Review

NPPES record last updated: June 16, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jun 16, 2025, Apr 12, 2020 (2 updates tracked since 2020).

About Dr. William Sidelinger Md NPPES

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

DR. WILLIAM SIDELINGER MD (NPI 1467071209) is an individual child & adolescent psychiatry provider in Worcester, Massachusetts, licensed in Massachusetts (1023236) and active in the NPI registry since April 2020. He is enrolled in Medicare PECOS and is a graduate of University Of Massachusetts Medical School (2020).

NPPES Registry Identity

NPI1467071209
Entity TypeIndividualMale
Primary Taxonomy2084P0804X
Provider Legal NameDR. WILLIAM SIDELINGERCredential: MD
Location Address309 BELMONT STWorcester, MA 01604-1059
Mailing Address1601 23rd Avenue South, Training Office Suite 3105 VphNashville, TN 37212
Phone(508) 368-3300
Sole ProprietorNo
Medical School CMSUniversity Of Massachusetts Medical SchoolGraduated 2020
Enumeration DateApril 12, 2020
Last NPPES UpdateJune 16, 20252 updates tracked since enumeration
NPPES CertifiedJune 16, 2025
✔ NPI 1467071209 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · Child & Adolescent PsychiatryAllopathic & Osteopathic Physicians
Taxonomy Code2084P0804X
License✔ Licensed in MA · 1023236
Definition
Child & Adolescent Psychiatry is a subspecialty of psychiatry with additional skills and training in the diagnosis and treatment of developmental, behavioral, emotional, and mental disorders of childhood and adolescence.
309 BELMONT ST, Worcester, MA 01604
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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. William Sidelinger Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID9830655166
PECOS Enrollment IDI20260728001362
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 Reassignment

Medicare enrollment records show William Sidelinger reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

The Commonwealth Of Massachusetts
Same address
Psychiatry
309 BELMONT ST
Worcester, MA 01604
  • Reassigned Medicare billing, Massachusetts enrollment
  • 59 clinicians in this Medicare group
NPI 1275680456 (508) 368-4000

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

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.

CRYSTALL HOLLENKAMP LICSW
Social Worker (Clinical)
309 BELMONT ST
WORCESTER, MA 01604
Worcester County (508) 368-0667
DANA EVE PALIT MSW
Social Worker (Clinical)
309 BELMONT ST
WORCESTER, MA 01604
Worcester County (508) 368-0529
DANA LYNN MCMANNUS LICSW
Social Worker (Clinical)
309 BELMONT ST
WORCESTER, MA 01604
Worcester County (508) 368-3328
PIOTR KARWOWSKI D.M.D.
Dentist
309 BELMONT ST
WORCESTER, MA 01604
Worcester County (847) 727-7661
MR. ADEMOLA SOLOMON OBELE PMHNP-BC
Nurse Practitioner (Psychiatric/Mental Health)
309 BELMONT ST
WORCESTER, MA 01604
Worcester County (508) 615-6001
EZINNE OBIJIAKU
Nurse Practitioner (Psychiatric/Mental Health)
309 BELMONT ST
WORCESTER, MA 01604
Worcester County (857) 312-9702
COLLEEN MARIE DOYLE LICSW
Social Worker (Clinical)
309 BELMONT ST
WORCESTER, MA 01604
Worcester County (508) 368-4000
MISS REGINA ELAINE AMORELLO LICSW
Social Worker (Clinical)
309 BELMONT ST
WORCESTER, MA 01604
Worcester County (508) 368-3795

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 William Sidelinger's NPI number?

The NPI number for William Sidelinger is 1467071209. It was assigned to this individual provider in the NPPES registry on April 12, 2020.

Where is William Sidelinger located?

William Sidelinger practices at 309 Belmont St, Worcester, MA 01604. The listed phone number is (508) 368-3300.

What is William Sidelinger's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Child & Adolescent Psychiatry, with taxonomy code 2084P0804X.

Is William Sidelinger enrolled in Medicare?

Yes. William Sidelinger is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for William Sidelinger's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Sidelinger reassigns Medicare benefits to The Commonwealth Of Massachusetts (Worcester, MA). The 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 William Sidelinger's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for William Sidelinger was last updated on June 16, 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.