JOHN Y KO MD
NPI 1972605541
Internal Medicine - Interventional Cardiology in Sacramento, CA
About John Y Ko Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JOHN Y KO MD (NPI 1972605541) is an individual interventional cardiology provider in Sacramento, California, licensed in California (A99005) and active in the NPI registry since September 2006. He is enrolled in Medicare PECOS and is a graduate of University Of California, Geffen School Of Medicine (2004).
NPPES Registry Identity
Specialties & Licenses
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
John Y Ko 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 Reassignment
Medicare enrollment records show John Ko reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Stockton, CA 95210
- Reassigned Medicare billing, California enrollment
- 20,078 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 95819 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 2
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 John Ko's NPI number?
The NPI number for John Ko is 1972605541. It was assigned to this individual provider in the NPPES registry on September 2, 2006.
Where is John Ko located?
John Ko practices at 3941 J St Ste 260, Sacramento, CA 95819. The listed phone number is (916) 736-2323.
What is John Ko's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Interventional Cardiology, with taxonomy code 207RI0011X.
Is John Ko enrolled in Medicare?
Yes. John Ko 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 organization bills Medicare for John Ko's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Ko reassigns Medicare benefits to Permanente Medical Group Inc (Stockton, CA). 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 John Ko'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 John Ko was last updated on September 28, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 27 days 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.
# John Y Ko, MD · NPI 1972605541
Interventional Cardiology physician in Sacramento, California. Individual provider, active in the CMS NPPES registry since September 2, 2006.
## Identity
- **NPI:** 1972605541 (Entity type: Individual)
- **Enumerated:** September 2, 2006
- **Primary specialty:** Internal Medicine - Interventional Cardiology · taxonomy 207RI0011X
- **State license:** A99005 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 3941 J ST STE 260, Sacramento, CA 95819-3633
- **Phone:** (916) 736-2323 · **Fax:** (916) 736-0620
## 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:** Permanente Medical Group Inc (NPI 1548343510, Stockton, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of California, Geffen School Of Medicine, class of 2004
## Record status
- **NPPES last updated:** September 28, 2026
---
Source: [NPI Profile](https://npiprofile.com/npi/1972605541) · Data from the CMS NPPES public registry.