Dr. Allen Lloyd Iseri, M.D.

Dr. Allen Lloyd Iseri is a Pediatrics Physician provider (Pediatrics) practicing in Anaheim, CA, registered in the NPPES registry with NPI 1821021221 since 2006. The credential MD stands for Doctor of Medicine. Practices at Allen L. Iseri M.D. (listed at the same practice address in NPPES).

✓ Active NPI ✓ Valid NPI checksum Sole proprietor

NPI	1821021221
Entity type	Individual (Type 1)
Name	Dr. Allen Lloyd Iseri
Credential	M.D.
Sex	Male
Practice address	Anaheim, CA, 92807
Phone	7142825437
Fax	7142828724
Enumeration date	2006-07-09
Last updated in NPPES	2014-07-07

Street address withheld — NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

Taxonomy code	Specialty	Primary	License	State
208000000X	Pediatrics Physician	Primary	G29008	CA

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

Copy-ready billing details

Provider: Allen Iseri, M.D.
NPI: 1821021221
Taxonomy: 208000000X (Pediatrics Physician)
Address: Anaheim, CA, 92807

Other providers at this practice address

NPI	Name	Type	Specialty	Location
1629235585	Allen L. Iseri M.D.	Organization	Pediatrics Physician	Anaheim, CA
1265733315	Patricia Iseri	Individual	Pediatric Nurse Practitioner	Anaheim, CA
1659708436	Jennifer Tucker	Individual	Pediatrics Physician	Anaheim, CA

Verify this record

Cross-check NPI 1821021221 against the authoritative CMS record: view Dr. Allen Lloyd Iseri on the official NPPES registry .

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 or validate an NPI number.

Frequently asked questions

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.

What specialty is Allen Iseri?

Allen Iseri is registered in NPPES with the primary taxonomy of Pediatrics Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2014-07-07.