DR. JOHN JACOB KAKKANATHU M.D.
NPI 1346458411
Internal Medicine in Saint Louis, MO
About Dr. John Jacob Kakkanathu M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JOHN JACOB KAKKANATHU M.D. (NPI 1346458411) is an individual internal medicine provider in Saint Louis, Missouri, licensed in Missouri (2009008964) and active in the NPI registry since May 2007. He is enrolled in Medicare PECOS, is affiliated with Mercy Hospital St Louis, and is a graduate of University Of Illinois College Of Med (chi/peor/rock/chm-urb) (2006).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 4
Accepted Insurance
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. John Jacob Kakkanathu 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.
Medicare Billing Reassignments
6Medicare enrollment records show John Kakkanathu reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Saint Louis, MO 63141
- Reassigned Medicare billing, Missouri enrollment
- 435 clinicians in this Medicare group
Saint Louis, MO 63141
- Reassigned Medicare billing, Missouri enrollment
- 326 clinicians in this Medicare group
Saint Louis, MO 63128
- Reassigned Medicare billing, Missouri enrollment
- Medicare enrollment name: St Anthonys Physician Organization Hospitalist Services Lc
- 340 clinicians in this Medicare group
Winfield, MO 63389
- Reassigned Medicare billing, Missouri enrollment
- 229 clinicians in this Medicare group
Festus, MO 63028
- Reassigned Medicare billing, Missouri enrollment
- 299 clinicians in this Medicare group
Washington, MO 63090
- Reassigned Medicare billing, Missouri enrollment
- 261 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.
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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Mercy Hospital St Louis
Acute Care Hospitals · Saint Louis, MOPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 63141 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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SAINT LOUIS, MO 63141
SAINT LOUIS, MO 63141
SAINT LOUIS, MO 63141
SAINT LOUIS, MO 63141
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 Kakkanathu's NPI number?
The NPI number for John Kakkanathu is 1346458411. It was assigned to this individual provider in the NPPES registry on May 20, 2007.
Where is John Kakkanathu located?
John Kakkanathu practices at 621 S New Ballas Rd Suite 3016B, Saint Louis, MO 63141. The listed phone number is (314) 251-6339.
What is John Kakkanathu's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is John Kakkanathu enrolled in Medicare?
Yes. John Kakkanathu 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 John Kakkanathu's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Kakkanathu reassigns Medicare benefits to 6 organizations: Mercy Hospitals East Communities (Saint Louis, MO), Mercy Clinic Adult Hospitalists - St. Louis, LLC (Saint Louis, MO), St Anthonys Physician Organization Hospitalist Services, L.C. (Saint Louis, MO), Mercy Hospital Lincoln (Winfield, MO), Mercy Clinic Adult Hospitalists- Jefferson, LLC (Festus, MO) and 1 more organization, listed in the Medicare section above. 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 John Kakkanathu's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does John Kakkanathu accept?
Health plans from Anthem Blue Cross and Blue Shield list John Kakkanathu as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is John Kakkanathu affiliated with any hospitals?
According to CMS data, John Kakkanathu is affiliated with Mercy Hospital St Louis.
When was this NPI record last updated?
The NPPES record for John Kakkanathu was last updated on July 17, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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. John Jacob Kakkanathu, M.D. · NPI 1346458411
Internal Medicine physician in Saint Louis, Missouri. Individual provider, active in the CMS NPPES registry since May 20, 2007.
## Identity
- **NPI:** 1346458411 (Entity type: Individual)
- **Enumerated:** May 20, 2007
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 2009008964 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 621 S NEW BALLAS RD, SUITE 3016B, Saint Louis, MO 63141-8232
- **Phone:** (314) 251-6339 · **Fax:** (314) 251-4564
## 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:** 6 organizations under Medicare reassignment (form CMS-855R): Mercy Hospitals East Communities (NPI 1851431738, Saint Louis, MO); Mercy Clinic Adult Hospitalists - St. Louis, LLC (NPI 1841235108, Saint Louis, MO); St Anthonys Physician Organization Hospitalist Services, L.C. (NPI 1407216336, Saint Louis, MO); Mercy Hospital Lincoln (NPI 1386040178, Winfield, MO); Mercy Clinic Adult Hospitalists- Jefferson, LLC (NPI 1083052492, Festus, MO); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Illinois College Of Med, class of 2006
## Record status
- **NPPES last updated:** July 17, 2014
- **Other identifiers:** Medicare PIN 133360013 (MO); Other P00744531 (MO); Medicaid 1346458411 (MO); and 1 more
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Source: [NPI Profile](https://npiprofile.com/npi/1346458411) · Data from the CMS NPPES public registry.