WILLIAM REGAN M.D.
NPI 1164576955
Psychiatry & Neurology - Psychiatry in Nashville, TN

Q: What is William Regan's NPI number?

The NPI number for William Regan is 1164576955. It was assigned to this individual provider in the NPPES registry on January 22, 2007.

Q: What is William Regan's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

Q: When was this NPI record last updated?

The NPPES record for William Regan was last updated on February 25, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.

Active since January 22, 2007PECOS EnrolledAccepts Medicare Assignment

221 STEWARTS FERRY PIKE, NASHVILLE, TN 37214(615) 902-7461 Get Directions Write a Review

NPPES record last updated: February 25, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

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About William Regan M.d. NPPES

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

WILLIAM REGAN M.D. (NPI 1164576955) is an individual psychiatry provider in Nashville, Tennessee, licensed in Tennessee (MD0000014753) and active in the NPI registry since January 2007. He is enrolled in Medicare PECOS, maintains a secondary practice location in Hannibal, and is a graduate of University Of Louisville School Of Medicine (1982).

NPPES Registry Identity

NPI1164576955

Entity TypeIndividualMale

Primary Taxonomy2084P0800X

Provider Legal NameWILLIAM REGANCredential: M.D.

Location Address221 STEWARTS FERRY PIKENashville, TN 37214-3325

Mailing Address221 Stewarts Ferry PikeNashville, TN 37214-3325 · (615) 902-7461

Phone(615) 902-7461

Sole ProprietorNo

Medical School CMSUniversity Of Louisville School Of MedicineGraduated 1982

Enumeration DateJanuary 22, 2007

Last NPPES UpdateFebruary 25, 2026

NPPES CertifiedFebruary 25, 2026

✔ NPI 1164576955 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · PsychiatryAllopathic & Osteopathic Physicians

Taxonomy Code2084P0800X

Licenses✔ Licensed in TN · MD0000014753✔ Licensed in IL · 036177893✔ Licensed in MO · 2025019372

Definition

A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.

221 STEWARTS FERRY PIKE, Nashville, TN 37214

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Secondary Practice Location 1

Location 16000 Hospital DrHannibal, MO 63401-6887 · Phone (573) 629-3342 · Fax (573) 629-3432

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

William Regan M.d. 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.

PECOS PAC ID2860584638

PECOS Enrollment IDI20070824000143, I20170103000816, I20170209001732, I20180622002496, I20251123000006, I20251212002265

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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 37214 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

$160.89 typical visit price

range $52.64 – $160.89

Typical copayment $40.22 (range $13.16 – $40.22)

Most-billed visit code 99205

Established Patient

$66.01 typical visit price

range $16.72 – $131.41

Typical copayment $16.50 (range $4.18 – $32.85)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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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.

JOHN J MARTENS APRN

Nurse Practitioner (Psychiatric/Mental Health)