Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Howard L. Alt, MD, Sc

Q: What is the NPI number for Howard L. Alt, MD, Sc?

The NPI for Howard L. Alt, MD, Sc is 1821203720, a Type 2 (organization) record in the CMS NPPES registry.

Preferred Provider Organization in Chicago, IL · enumerated 2007 · authorized official Howard Alt, President.

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

National Provider Identifier

1821203720

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)

Legal business name Howard L. Alt, MD, Sc

Practice address 645 N Michigan Ave Ste 422, Chicago, IL, 60611

Phone (312) 642-0060

Fax (312) 642-1403

Enumeration date May 14, 2007

Last updated in NPPES Nov 29, 2008

Taxonomy & classification

305R00000X Preferred Provider Organization Managed Care Organizations · License 36-45795 (IL) Primary

Authorized official

Name Howard Alt

Title President

Phone (312) 642-0060

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

What is the NPI number for Howard L. Alt, MD, Sc?

The NPI for Howard L. Alt, MD, Sc is 1821203720, a Type 2 (organization) record in the CMS NPPES registry.

Who is the authorized official for Howard L. Alt, MD, Sc?

NPPES lists Howard Alt (President) as the authorized official for this organization.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-11-29.