1. Home
  2. Directory
  3. Connecticut
  4. Hartford
  5. Pathology
  6. NPI Profile

DR. AILEEN ONG BACAY MD
NPI 1598724494
Pathology - Anatomic Pathology & Clinical Pathology in Hartford, CT

Active since March 20, 2006PECOS Enrolled
114 WOODLAND ST, ST FRANCIS HOSPITAL DEPT OF PATHOLOGY, HARTFORD, CT 06105(860) 714-6119(860) 714-8021 Get Directions Write a Review

NPPES record last updated: November 2, 2021. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Dr. Aileen Ong Bacay Md NPPES

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

DR. AILEEN ONG BACAY MD (NPI 1598724494) is an individual anatomic pathology & clinical pathology provider in Hartford, Connecticut, licensed in Connecticut (030324) and active in the NPI registry since March 2006. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1598724494
Entity TypeIndividualFemale
Primary Taxonomy207ZP0102X
Provider Legal NameDR. AILEEN ONG BACAYCredential: MD
Location Address114 WOODLAND ST, ST FRANCIS HOSPITAL DEPT OF PATHOLOGYHartford, CT 06105
Mailing Address114 Woodland St, St Francis Hospital Dept Of PathologyHartford, CT 06105 · (860) 714-6119 · Fax (860) 714-8021
Phone(860) 714-6119
Fax(860) 714-8021
Sole ProprietorYes
Enumeration DateMarch 20, 2006
Last NPPES UpdateNovember 2, 2021
NPPES CertifiedNovember 2, 2021
✔ NPI 1598724494 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPathology · Anatomic Pathology & Clinical PathologyAllopathic & Osteopathic Physicians
Taxonomy Code207ZP0102X
License✔ Licensed in CT · 030324
Definition
A pathologist deals with the causes and nature of disease and contributes to diagnosis, prognosis and treatment through knowledge gained by the laboratory application of the biologic, chemical and physical sciences. A pathologist uses information gathered from the microscopic examination of tissue specimens, cells and body fluids, and from clinical laboratory tests on body fluids and secretions for the diagnosis, exclusion and monitoring of disease.
114 WOODLAND ST, Hartford, CT 06105
Open in Google Maps ↗

Other Names 1

Other Name (5)Aileen T Ong-bacay Md

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Aileen Ong Bacay 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 Reassignment

Medicare enrollment records show Aileen Ong Bacay reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Saint Francis Care Medical Group, P.C.
Same address
Family Medicine
114 WOODLAND ST, SAINT FRANCIS CARE MEDICAL GROUP PC
Hartford, CT 06105
  • Reassigned Medicare billing, Connecticut enrollment
  • Medicare enrollment name: Saint Francis Care Medical Group PC
  • 26 clinicians in this Medicare group
NPI 1760690101 (860) 979-1880

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 6

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.

Pathology examination of tissue using a microscope, intermediate complexity 88305
A pathology examination of tissue with intermediate complexity involves studying a small sample of your body tissue under a microscope. This helps in identifying any abnormal cells or signs of disease. It's a detailed process requiring expert analysis to ensure accurate results.
256 services107 patients
Special stained specimen slides to examine tissue, each additional procedure 88341
Special stained specimen slides are used to analyze tissue in detail. In this process, extra procedures may be needed for a more thorough examination. These involve applying special stains to the tissue on slides, enhancing specific elements for closer study.
46 services15 patients
Cell examination of specimen, selective cellular enhancement technique 88112
Cell examination of a specimen using selective cellular enhancement technique is a lab process that improves the visibility of certain cells in a sample. It helps in identifying abnormalities or diseases. The process is non-invasive, safe, and aids in accurate diagnosis.
34 services30 patients
Special stained specimen slides to examine tissue, initial procedure 88342
This procedure involves the use of specially stained slides to examine tissue samples. The initial process involves obtaining a small tissue sample from your body. This sample is then placed on a slide and stained with special dyes to highlight different structures and elements. The stained slide is then examined under a microscope to help diagnose any potential health issues.
34 services27 patients
Pathology examination of tissue using a microscope, moderately high complexity 88307
A pathology examination of tissue with moderate complexity involves a detailed study of a small tissue sample from your body. Using a microscope, experts analyze the tissue's structure and cells to identify any abnormalities. This helps in diagnosing various health conditions accurately.
18 services11 patients
Pathology examination of tissue using a microscope, moderately low complexity 88304
A pathology examination of tissue, moderately low complexity, involves studying a small sample of your body tissue under a microscope. It helps to identify any abnormal cells or diseases. It's a routine procedure, not complex, and provides crucial insights for your diagnosis.
11 services11 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 06105 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
$106.68 typical visit price
range $19.76 – $149.26
Typical copayment $26.67 (range $4.94 – $37.31)
Most-billed visit code 99214
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 20

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

GAGANDEEP SINGH MD
Hospitalist
114 WOODLAND ST
HARTFORD, CT 06105
Capitol Planning Region (860) 714-7446
MRS. BROOKE M P CHAVES APRN
Nurse Practitioner (Family)
114 WOODLAND ST
HARTFORD, CT 06105
Capitol Planning Region (860) 714-4680
JOCELYN CALABRO APRN
Nurse Practitioner (Adult Health)
114 WOODLAND ST
HARTFORD, CT 06105
Capitol Planning Region (860) 714-4000
SAINT FRANCIS HOSPITAL AND MEDICAL CENTER
Clinic/Center (Dental)
114 WOODLAND ST
HARTFORD, CT 06105
Capitol Planning Region (860) 714-4995
PHILLIP DENNEN MD
Anesthesiology
114 WOODLAND ST
HARTFORD, CT 06105
Capitol Planning Region (860) 714-6654
FRANK J SETTER MD
Anesthesiology
114 WOODLAND ST
HARTFORD, CT 06105
Capitol Planning Region (860) 714-6654
TRINITY HEALTH OF NEW ENGLAND PROVIDER NETWORK ORGANIZATION INC
Internal Medicine
114 WOODLAND ST, SAINT FRANCIS MEDICAL GROUP INC.
HARTFORD, CT 06105
Capitol Planning Region (860) 714-1325
CATHERINE ANN CHAKAR-IYENGAR CRNA
Nurse Anesthetist, Certified Registered
114 WOODLAND ST, WOODLAND ANESTHESIOLOGY ASSOCIATES PC
HARTFORD, CT 06105
Capitol Planning Region (860) 614-6654

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 Aileen Ong Bacay's NPI number?

The NPI number for Aileen Ong Bacay is 1598724494. It was assigned to this individual provider in the NPPES registry on March 20, 2006. The provider is also known as Aileen T Ong-Bacay MD.

Where is Aileen Ong Bacay located?

Aileen Ong Bacay practices at 114 Woodland St St Francis Hospital Dept Of Pathology, Hartford, CT 06105. The listed phone number is (860) 714-6119.

What is Aileen Ong Bacay's specialty?

The primary specialty registered for this NPI is Pathology, specializing in Anatomic Pathology & Clinical Pathology, with taxonomy code 207ZP0102X.

Is Aileen Ong Bacay enrolled in Medicare?

Yes. Aileen Ong Bacay is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Aileen Ong Bacay's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Aileen Ong Bacay reassigns Medicare benefits to Saint Francis Care Medical Group, P.C. (Hartford, CT). 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 Aileen Ong Bacay'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 Aileen Ong Bacay was last updated on November 2, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.