Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Dr. John R. Markham PC

Q: What type of organization is Dr. John R. Markham PC?

Dr. John R. Markham PC is registered in NPPES as a Ophthalmology Physician (its primary provider taxonomy).

Ophthalmology Physician in Wickenburg, AZ · enumerated 2009 · authorized official Greg Davis, Administrator.

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

National Provider Identifier

1659513760

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Registry record

Entity type Organization (Type 2)

Legal business name Dr. John R. Markham PC

Other name <Unavail>

Practice address 25 W Yavapai St, Wickenburg, AZ, 85390

Phone (928) 684-2880

Fax (928) 684-3209

Enumeration date Apr 3, 2009

Last updated in NPPES Apr 3, 2009

Taxonomy & classification

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 4498 (AZ) Primary

Authorized official

Name Greg Davis

Title Administrator

Phone (928) 778-3950

Other identifiers

Identifier	Type	State	Issuer
2Z6546	Other	AZ	HEALTH NET
NNP12599	Other	AZ	UNIVERSAL HEALTH CARE
033176-001	Other	AZ	MERCYCARE
190721	Other	AZ	AHCCCS
190721	Medicaid	AZ	-
3421045	Other	AZ	CIGNA
572818	Other	AZ	RAN-AMN
AZ01170	Other	AZ	MEDICARE SUBMITTER ID
7742967	Other	AZ	AETNA
866291-9714	Other	AZ	HUMANA

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

What is a Type 2 NPI?

A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.

What type of organization is Dr. John R. Markham PC?

Dr. John R. Markham PC is registered in NPPES as a Ophthalmology Physician (its primary provider taxonomy).

Providers at this address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-04-03.