DR. KARTHI SUBBANNAN M.D
NPI 1154443091
Internal Medicine - Hematology & Oncology in Johns Creek, GA
About Dr. Karthi Subbannan M.d NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. KARTHI SUBBANNAN M.D (NPI 1154443091) is an individual hematology & oncology provider in Johns Creek, Georgia, licensed in Georgia (062169) and active in the NPI registry since April 2007. She is enrolled in Medicare PECOS, is affiliated with Northside Hospital Forsyth, and is a graduate of Other (1996).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 2
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. Karthi Subbannan 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 Reassignment
Medicare enrollment records show Karthi Subbannan reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Sandy Springs, GA 30342
- Reassigned Medicare billing, Georgia enrollment
- 163 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 5
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 5
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Northside Hospital Forsyth
Acute Care Hospitals · Cumming, GANorthside Hospital Gwinnett
Acute Care Hospitals · Lawrenceville, GANorthside Hospital
Acute Care Hospitals · Atlanta, GAEmory Johns Creek Hospital
Acute Care Hospitals · Johns Creek, GANorthside Hospital Duluth
Acute Care Hospitals · Duluth, GAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 30097 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 5
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
JOHNS CREEK, GA 30097
JOHNS CREEK, GA 30097
JOHNS CREEK, GA 30097
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 Karthi Subbannan's NPI number?
The NPI number for Karthi Subbannan is 1154443091. It was assigned to this individual provider in the NPPES registry on April 4, 2007.
Where is Karthi Subbannan located?
Karthi Subbannan practices at 6300 Hospital Pkwy Ste 300, Johns Creek, GA 30097. The listed phone number is (770) 623-8965.
What is Karthi Subbannan's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.
Is Karthi Subbannan enrolled in Medicare?
Yes. Karthi Subbannan 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 Karthi Subbannan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Karthi Subbannan reassigns Medicare benefits to Nsh Cancer Institute Professional Services G, LLC (Sandy Springs, GA). 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 Karthi Subbannan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Karthi Subbannan accept?
Health plans from Ambetter Health, Ambetter from Absolute Total Care, Ambetter of Alabama, Ambetter of North Carolina and Ambetter of Tennessee and 1 other insurer list Karthi Subbannan 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 Karthi Subbannan affiliated with any hospitals?
According to CMS data, Karthi Subbannan is affiliated with Northside Hospital Forsyth, Northside Hospital Gwinnett, Northside Hospital, Emory Johns Creek Hospital and Northside Hospital Duluth.
When was this NPI record last updated?
The NPPES record for Karthi Subbannan was last updated on August 19, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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. Karthi Subbannan, M.D · NPI 1154443091
Hematology & Oncology physician in Johns Creek, Georgia. Individual provider, active in the CMS NPPES registry since April 4, 2007.
## Identity
- **NPI:** 1154443091 (Entity type: Individual)
- **Enumerated:** April 4, 2007
- **Primary specialty:** Internal Medicine - Hematology & Oncology · taxonomy 207RH0003X
- **State license:** 062169 (Georgia)
- **Sole proprietor:** No
## Practice location
- **Address:** 6300 HOSPITAL PKWY STE 300, Johns Creek, GA 30097-1982
- **Phone:** (770) 623-8965 · **Fax:** (770) 623-4018
## 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:** Nsh Cancer Institute Professional Services G, LLC (NPI 1144571381, Sandy Springs, GA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1996
## Record status
- **NPPES last updated:** August 19, 2020
- **Other identifiers:** Medicaid 738700884C (GA); Medicaid 738700884D (GA)
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Source: [NPI Profile](https://npiprofile.com/npi/1154443091) · Data from the CMS NPPES public registry.