Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Chicago Arthritis LLC

Q: What is the NPI number for Chicago Arthritis LLC?

The NPI for Chicago Arthritis LLC is 1275231813, a Type 2 (organization) record in the CMS NPPES registry.

Non-Pharmacy Dispensing Site in Chicago, IL · enumerated 2023 · authorized official Siddharth Tambar, Owner.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1275231813

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Registry record

Entity type Organization (Type 2)

Legal business name Chicago Arthritis LLC

Practice address 618 W Fulton St, Chicago, IL, 60661

Phone (773) 348-7171

Fax (773) 348-7414

Enumeration date Feb 22, 2023

Last updated in NPPES Feb 23, 2023

Taxonomy & classification

207RR0500X Rheumatology Physician Allopathic & Osteopathic Physicians Secondary

332900000X Non-Pharmacy Dispensing Site Suppliers Primary

Authorized official

Name Siddharth Tambar

Title Owner

Phone (773) 348-7171

Other identifiers

Identifier	Type	State	Issuer
F1003344031	Medicaid	IL	-

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Who is the authorized official for Chicago Arthritis LLC?

NPPES lists Siddharth Tambar (Owner) as the authorized official for this organization.

What is the NPI number for Chicago Arthritis LLC?

The NPI for Chicago Arthritis LLC is 1275231813, a Type 2 (organization) record in the CMS NPPES registry.

Providers at this address

Browse all →

Mitchell Sheinkop Orthopaedic Surgery Physician · Chicago, IL NPI 1073592861 Siddharth Tambar Rheumatology Physician · Chicago, IL NPI 1477655488 Leah Brown Physician Assistant · Chicago, IL NPI 1780814525 Elizabeth Kiracofe Dermatology Physician · Chicago, IL NPI 1336400217 Chicago Arthritis LLC Rheumatology Physician · Chicago, IL NPI 1477915221 Kiracofe MD Medical, LLC Dermatology Physician · Chicago, IL NPI 1124675244 Greyledge Orthobiologic Group LLC Orthopaedic Surgery Physician · Chicago, IL NPI 1619640331

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-02-23.