Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Christopher Mark John, D.O.

Diagnostic Radiology Physician in Orlando, FL · enumerated 2007 · practices at Anesthesiologists of Greater Orlando Inc.

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

National Provider Identifier

1669679569

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Registry record

Entity type Individual (Type 1)

Name Dr. Christopher Mark John

Credential D.O.

Sex Male

Practice address 52 Underwood St, Orlando, FL, 32806

Phone (407) 481-7174

Fax (321) 843-6080

Enumeration date Jul 3, 2007

Last updated in NPPES Sep 25, 2025

Taxonomy & licenses

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License OS15940 (FL) Primary

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License 20A20771 (CA) Secondary

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License P0069 (TX) Secondary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

Other identifiers

Identifier	Type	State	Issuer
127609200	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

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 Christopher John?

Christopher John is registered in NPPES with the primary taxonomy of Diagnostic Radiology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Other providers at this practice address

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Karla Castro-Frenzel Pediatric Anesthesiology Physician · Orlando, FL NPI 1245228378 Ala Haddadin Critical Care Medicine (Anesthesiology) Physician · Orlando, FL NPI 1982685673 Srinivasan Adayapalam Anesthesiology Physician · Orlando, FL NPI 1053392779 Daniel Sabatelli Anesthesiology Physician · Orlando, FL NPI 1922068683 Haney Assaad Internal Medicine Physician · Orlando, FL NPI 1730119702 Mariko Ford Anesthesiology Physician · Orlando, FL NPI 1811000219 Todd Mccoy Medical Physician Assistant · Orlando, FL NPI 1508965674 Katherine Walsh Anesthesiology Physician · Orlando, FL NPI 1841371994

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-25.