Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Douglas T Summerfield, MD

Critical Care Medicine (Internal Medicine) Physician in Mason City, IA · enumerated 2008.

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

National Provider Identifier

1518120633

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Douglas T Summerfield

Credential MD

Sex Male

Practice address 1000 4th St Sw, Mason City, IA, 50401

Phone (641) 428-6999

Fax (641) 428-6678

Enumeration date Jul 9, 2008

Last updated in NPPES May 30, 2023

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 0101246408 (VA) Secondary

207RC0200X Critical Care Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License 54611 (MN) Secondary

207RC0200X Critical Care Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License 105450 (MN) Secondary

207RC0200X Critical Care Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License 41014 (IA) 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
408284	Other	VA	ANTHEM BC/BS
5915367	Medicaid	NC	-
PAR	Other	VA	MULTIPLAN
PAR	Other	VA	CIGNA
10061644	Other	VA	OPTIMA HEALTH
1518120633	Medicaid	VA	-
PAR	Other	VA	VIRGINIA HEALTH NETWORK
PAR	Other	VA	AETNA
PAR	Other	VA	CORVEL/CORCARE
PAR	Other	VA	VA PREMIER HEALTH PLAN
PAR	Other	VA	USA MANAGED CARE
PAR	Other	VA	UNITED HEALTH CARE/MAMSI
PAR	Other	VA	FIRST HEALTH COMMERCIAL/COVENTRY HEALTH/SOUTHERN HEALTH

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

Where does Douglas Summerfield practice?

The practice location on file with NPPES is in Mason City, IA. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Douglas Summerfield?

The National Provider Identifier (NPI) for Douglas Summerfield is 1518120633, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-05-30.