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

Dr. John R Markham, O D

Optometrist in Prescott, AZ · enumerated 2006.

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

National Provider Identifier

1225094550

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Registry record

Entity type Individual (Type 1)

Name Dr. John R Markham

Credential O D

Sex Male

Practice address Prescott, AZ, 86301

Phone (928) 778-3950

Fax (928) 778-3999

Enumeration date Apr 25, 2006

Last updated in NPPES Apr 20, 2016

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

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 142 (AZ) Primary

OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses. About the OD credential

Other identifiers

Identifier	Type	State	Issuer
033176	Medicaid	AZ	-
153165	Other	-	RAN & AMN
5858351	Other	-	AETNA
033176	Other	AZ	AHCCCS
866291-9714	Other	-	HUMANA
1263119	Other	AZ	MERCYCARE
Z63118	Other	AZ	GROUP MEDICARE - CLINIC
AZ0142	Other	-	EYEMED
15220	Other	-	AVESIS
AZ0142	Other	-	EYECARE DIRECT
AZ01170	Other	AZ	MEDICARE SUBMITTER ID - CLINIC
DM2NNP	Other	-	ARIZONA FOUNDATION
3Z0277	Other	AZ	HEALTH NET
NNP12599	Other	AZ	UNIVERSAL HEALTH CARE

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 John Markham's NPI record?

Cross-check NPI 1225094550 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1225094550 active?

Yes, as of the latest NPPES snapshot, NPI 1225094550 is active (record last updated 2016-04-20).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-04-20.