Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Ronald J. Field, M.D.

Pediatrics Physician in Paso Robles, CA · enumerated 2005 · practices at North County Pediatrics.

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

National Provider Identifier

1427034602

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Registry record

Entity type Individual (Type 1)

Name Ronald J. Field

Credential M.D.

Sex Male

Practice address Paso Robles, CA, 93446

Phone (805) 239-4222

Fax (805) 239-4832

Enumeration date Dec 19, 2005

Last updated in NPPES Jul 8, 2007

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

Taxonomy & licenses

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License G23915 (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
00G239151	Other	CA	BLUE SHIELD OF CA-FIRST S
1427034602	Other	-	NPI
G23915	Other	CA	MEDICAL LICENSE #
00G239150	Other	CA	BLUE SHEILD OF CA-VINE ST
4518387	Other	-	AETNA HMO

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 Ronald Field?

Ronald Field 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.

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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North County Pediatrics Pediatrics Physician · Paso Robles, CA NPI 1548462310

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.