KARUN MADHAV NAIR MD
NPI 1710514724
Internal Medicine - Rheumatology in Chicago, IL
About Karun Madhav Nair Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
KARUN MADHAV NAIR MD (NPI 1710514724) is an individual rheumatology provider in Chicago, Illinois, licensed in Illinois (036.164277) and active in the NPI registry since March 2020. He is enrolled in Medicare PECOS and is a graduate of Other (2020).
NPPES Registry Identity
Specialties & Licenses 2
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
Karun Madhav Nair 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 Karun Nair reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Walnut Creek, CA 94598
- Reassigned Medicare billing, California enrollment
- Medicare enrollment name: Arthritis And Rheumatology Medical Associates Inc
- 6 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 60612 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
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.
CHICAGO, IL 60612
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 Karun Nair's NPI number?
The NPI number for Karun Nair is 1710514724. It was assigned to this individual provider in the NPPES registry on March 27, 2020.
Where is Karun Nair located?
Karun Nair practices at 1620 W Harrison St, Chicago, IL 60612. The listed phone number is (312) 942-5000.
What is Karun Nair's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Rheumatology, with taxonomy code 207RR0500X.
Is Karun Nair enrolled in Medicare?
Yes. Karun Nair 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 Karun Nair's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Karun Nair reassigns Medicare benefits to Arthritis & Rheumatology Medical Associates, Inc (Walnut Creek, 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 Karun Nair'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 Karun Nair was last updated on May 19, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Karun Madhav Nair, MD · NPI 1710514724
Rheumatology physician in Chicago, Illinois. Individual provider, active in the CMS NPPES registry since March 27, 2020.
## Identity
- **NPI:** 1710514724 (Entity type: Individual)
- **Enumerated:** March 27, 2020
- **Primary specialty:** Internal Medicine - Rheumatology · taxonomy 207RR0500X
- **State license:** 036.164277 (Illinois)
- **Sole proprietor:** No
## Practice location
- **Address:** 1620 W HARRISON ST, Chicago, IL 60612-3801
- **Phone:** (312) 942-5000
## 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:** Arthritis & Rheumatology Medical Associates, Inc (NPI 1154403483, Walnut Creek, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2020
## Record status
- **NPPES last updated:** May 19, 2023
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Source: [NPI Profile](https://npiprofile.com/npi/1710514724) · Data from the CMS NPPES public registry.