DR. ANN YORK KAO MD
NPI 1588643282
Internal Medicine in Chelsea, MA
About Dr. Ann York Kao Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ANN YORK KAO MD (NPI 1588643282) is an individual internal medicine provider in Chelsea, Massachusetts, licensed in Massachusetts (220229) and active in the NPI registry since January 2006. She is enrolled in Medicare PECOS, is affiliated with Massachusetts General Hospital, and is a graduate of University Of Washington School Of Medicine (2000).
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 5
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
Dr. Ann York Kao Md 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
2Medicare enrollment records show Ann Kao reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Boston, MA 02114
- Reassigned Medicare billing, Massachusetts enrollment
- 6,360 clinicians in this Medicare group
Boston, MA 02114
- Reassigned Medicare billing, Massachusetts enrollment
- 6,234 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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Massachusetts General Hospital
Acute Care Hospitals · Boston, MAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 02150 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 Ann Kao's NPI number?
The NPI number for Ann Kao is 1588643282. It was assigned to this individual provider in the NPPES registry on January 11, 2006.
Where is Ann Kao located?
Ann Kao practices at 151 Everett Ave C51 Chelsea Healthcare Center-Urgent Care, Chelsea, MA 02150. The listed phone number is (617) 884-8302.
What is Ann Kao's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Ann Kao enrolled in Medicare?
Yes. Ann Kao 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 Ann Kao's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ann Kao reassigns Medicare benefits to 2 organizations: Massachusetts General Physicians Organization Inc (Boston, MA) and The General Hospital Corporation (Boston, MA). 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 Ann Kao's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Ann Kao affiliated with any hospitals?
According to CMS data, Ann Kao is affiliated with Massachusetts General Hospital.
When was this NPI record last updated?
The NPPES record for Ann Kao was last updated on August 3, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.
# Dr. Ann York Kao, MD · NPI 1588643282
Internal Medicine physician in Chelsea, Massachusetts. Individual provider, active in the CMS NPPES registry since January 11, 2006.
## Identity
- **NPI:** 1588643282 (Entity type: Individual)
- **Enumerated:** January 11, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 220229 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 151 EVERETT AVE C51, CHELSEA HEALTHCARE CENTER-URGENT CARE, Chelsea, MA 02150
- **Phone:** (617) 884-8302 · **Fax:** (617) 887-3704
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Massachusetts General Physicians Organization Inc (NPI 1801874573, Boston, MA); The General Hospital Corporation (NPI 1023049236, Boston, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Washington School Of Medicine, class of 2000
## Record status
- **NPPES last updated:** August 3, 2012
- **Other identifiers:** Other 369355 (MA); Medicare UPIN I09495; Medicaid 2070791 (MA); and 2 more
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Source: [NPI Profile](https://npiprofile.com/npi/1588643282) · Data from the CMS NPPES public registry.