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WILLIAM GUINAN MD
NPI 1144317520
Obstetrics & Gynecology in Manchester, CT

Active since October 06, 2006PECOS Enrolled
388 WEST CENTER ST, MANCHESTER, CT 06040(860) 649-1120(860) 645-8541 Get Directions Write a Review

NPPES record last updated: October 27, 2011. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About William Guinan Md NPPES

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

WILLIAM GUINAN MD (NPI 1144317520) is an individual obstetrics & gynecology provider in Manchester, Connecticut, licensed in Connecticut (028847) and active in the NPI registry since October 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1144317520
Entity TypeIndividualMale
Primary Taxonomy207V00000X
Provider Legal NameWILLIAM GUINANCredential: MD
Location Address388 WEST CENTER STManchester, CT 06040
Mailing Address388 West Center St, Manchester Obgyn AssocManchester, CT 06040 · (860) 645-6670 · Fax (860) 645-8541
Phone(860) 649-1120
Fax(860) 645-8541
Sole ProprietorNo
Enumeration DateOctober 6, 2006
Last NPPES UpdateOctober 27, 2011
✔ NPI 1144317520 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyObstetrics & GynecologyAllopathic & Osteopathic Physicians
Taxonomy Code207V00000X
License✔ Licensed in CT · 028847
Definition
An obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproductive system and associated disorders. This physician serves as a consultant to other physicians and as a primary physician for women.
388 WEST CENTER ST, Manchester, CT 06040
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Other Identifiers 3

Medicare UPINE52678
Medicaid001288473CT
Medicare ID-Type Unspecified160001616

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

William Guinan Md 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

3

Medicare enrollment records show William Guinan reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Trinity Health Of New England Provider Network Organization Inc
7.6 mi
Internal Medicine
114 WOODLAND ST, SAINT FRANCIS MEDICAL GROUP INC.
Hartford, CT 06105
  • Reassigned Medicare billing, Connecticut enrollment
  • 1,186 clinicians in this Medicare group
NPI 1003882812 (860) 714-1325
American Current Care PA
197 mi
Urgent Care
29 WINTER STREET
Norway, ME 04268
  • Reassigned Medicare billing, Connecticut enrollment
  • 31 clinicians in this Medicare group
NPI 1023294022 (507) 743-7399
Signify Health Medical Associates, PLLC
1,463 mi
General Practice
4055 VALLEY VIEW LN STE 700
Dallas, TX 75244
  • Reassigned Medicare billing, Connecticut enrollment
  • 167 clinicians in this Medicare group
NPI 1750845863 (972) 715-3800

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 06040 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
$138.84 typical visit price
range $60.82 – $183.10
Typical copayment $34.71 (range $15.20 – $45.77)
Most-billed visit code 99204
Established Patient
$75.55 typical visit price
range $19.76 – $149.26
Typical copayment $18.88 (range $4.94 – $37.31)
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.

Other Providers at the Same Location NPPES 7

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

LAWRENCE ARKY MD
Obstetrics & Gynecology
388 WEST CENTER ST, MANSHESTER OB-GYN ASSOC
MANCHESTER, CT 06040
Capitol Planning Region (860) 645-6670
DANIEL WELLING MD
Obstetrics & Gynecology
388 WEST CENTER ST
MANCHESTER, CT 06040
Capitol Planning Region (860) 649-1120
MARIA DIANA AVELLINO C.N.M.
Advanced Practice Midwife
388 WEST CENTER ST
MANCHESTER, CT 06040
Capitol Planning Region (860) 649-1120
AZIZA OMRANI MD
Obstetrics & Gynecology
388 WEST CENTER ST
MANCHESTER, CT 06040
Capitol Planning Region (860) 649-1120
MARY G GUINAN CNM
Advanced Practice Midwife
388 WEST CENTER ST
MANCHESTER, CT 06040
Capitol Planning Region (860) 649-1120
LON PHILIP MANFREDI M.D.
Obstetrics & Gynecology
388 WEST CENTER ST
MANCHESTER, CT 06040
Capitol Planning Region (860) 649-1120
JENNIFER SCHIRMER CNM
Advanced Practice Midwife
388 WEST CENTER ST, MANSHESTER OB-GYN ASSOC
MANCHESTER, CT 06040
Capitol Planning Region (860) 645-6670

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 Guinan's NPI number?

The NPI number for William Guinan is 1144317520. It was assigned to this individual provider in the NPPES registry on October 6, 2006.

Where is William Guinan located?

William Guinan practices at 388 West Center St, Manchester, CT 06040. The listed phone number is (860) 649-1120.

What is William Guinan's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.

Is William Guinan enrolled in Medicare?

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

Which organizations bill Medicare for William Guinan's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Guinan reassigns Medicare benefits to 3 organizations: Trinity Health Of New England Provider Network Organization Inc (Hartford, CT), American Current Care PA (Norway, ME) and Signify Health Medical Associates, PLLC (Dallas, TX). 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 William Guinan'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 Guinan was last updated on October 27, 2011. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 years 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.