Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark E Johns, MD

Hematology & Oncology Physician in Cincinnati, OH · enumerated 2007.

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

National Provider Identifier

1407040884

Verified

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Registry record

Entity type Individual (Type 1)

Name Mark E Johns

Credential MD

Sex Male

Practice address 601 Ivy Gtwy Ste 1100, Cincinnati, OH, 45245

Phone (513) 751-2273

Enumeration date Aug 29, 2007

Last updated in NPPES Apr 22, 2021

Taxonomy & licenses

207RX0202X Medical Oncology Physician Allopathic & Osteopathic Physicians · License 47008 (MN) Secondary

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License 35.125806 (OH) 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
34561500	Medicaid	WI	-
1407040884	Medicaid	MN	-
0139551	Medicaid	OH	-

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 Mark Johns?

Mark Johns is registered in NPPES with the primary taxonomy of Hematology & Oncology 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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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-04-22.