Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Theodore S. Ingrassia III, M.D.

Pulmonary Disease Physician in Rockford, IL · enumerated 2006.

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

National Provider Identifier

1437263662

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Registry record

Entity type Individual (Type 1)

Name Theodore S. Ingrassia III

Credential M.D.

Sex Male

Practice address 535 Roxbury Rd, Suite B600, Rockford, IL, 61107

Phone (815) 397-7212

Fax (815) 397-2539

Enumeration date Aug 17, 2006

Last updated in NPPES May 4, 2016

Taxonomy & licenses

207RP1001X Pulmonary Disease Physician Allopathic & Osteopathic Physicians · License 036 083892 (IL) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
101 00686	Other	IL	BLUE CROSS BLUE SHIELD
036 083892	Medicaid	IL	-
110060997	Other	IL	RAILROAD MEDICARE

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 specialty is Theodore Ingrassia?

Theodore Ingrassia is registered in NPPES with the primary taxonomy of Pulmonary Disease Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Other providers at this practice address

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Fredric Kullberg Pulmonary Disease Physician · Rockford, IL NPI 1912010273 Nadeem Hanif Pulmonary Disease Physician · Rockford, IL NPI 1972617181 Kenneth Mihelich Surgery Physician · Rockford, IL NPI 1649374737 Jacinto Obregon Surgery Physician · Rockford, IL NPI 1174627269 Perryville Surgical Associates Sc Surgery Physician · Rockford, IL NPI 1154427664 Meredydd Harper Acute Care Nurse Practitioner · Rockford, IL NPI 1245300284 Michelle Sandine Family Nurse Practitioner · Rockford, IL NPI 1457540379 Saint Anthony Medical Center Neurological Surgery Physician · Rockford, IL NPI 1871860056

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-05-04.