Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Constantinos Chrysostomou, MD

Pediatric Cardiology Physician in Fountain Valley, CA · enumerated 2006.

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

National Provider Identifier

1801868658

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Registry record

Entity type Individual (Type 1)

Name Dr. Constantinos Chrysostomou

Credential MD

Sex Male

Practice address 17360 Brookhurst Street, Attn: Network Management, Fountain Valley, CA, 92708

Phone (714) 377-2900

Enumeration date Feb 6, 2006

Last updated in NPPES Jun 23, 2022

Taxonomy & licenses

174400000X Specialist Other Service Providers · License MD426904 (PA) Secondary

2080P0202X Pediatric Cardiology Physician Allopathic & Osteopathic Physicians · License ME126009 (FL) Secondary

2080P0202X Pediatric Cardiology Physician Allopathic & Osteopathic Physicians · License C129462 (CA) 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
101479082	Medicaid	PA	-
016288000	Medicaid	FL	-

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.

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Frequently asked questions

How do I verify Constantinos Chrysostomou's NPI record?

Cross-check NPI 1801868658 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1801868658 active?

Yes, as of the latest NPPES snapshot, NPI 1801868658 is active (record last updated 2022-06-23).

Other providers at this practice address

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Helen Steele Family Medicine Physician · Fountain Valley, CA NPI 1548243694 Lorena Asher Nurse Practitioner · Fountain Vallet, CA NPI 1538110358 Richard Cho Internal Medicine Physician · Fountain Valley, CA NPI 1275619983 Marisa Desilva Family Nurse Practitioner · Fountain Valley, Ca, CA NPI 1083815229 Billy Le Hospitalist Physician · Fountain Valley, CA NPI 1255656963 Sheila Nguyen Internal Medicine Physician · Fountain Valley, CA NPI 1033435987 Alvin Merilles Family Nurse Practitioner · Fountain Valley, CA NPI 1629421458 Diana Pham Marriage & Family Therapist · Fountain Valley, CA NPI 1225532757

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-06-23.