Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Melvin O Walker, MD

Internal Medicine Physician in Springfield, MO · enumerated 2006 · practices at St Johns Clinic Inc.

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

National Provider Identifier

1558306704

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Registry record

Entity type Individual (Type 1)

Name Melvin O Walker

Credential MD

Sex Male

Practice address 2754 W Republic Rd, Springfield, MO, 65807

Phone (417) 881-8812

Fax (417) 881-1618

Enumeration date Jun 19, 2006

Last updated in NPPES Jan 30, 2012

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License R9801 (MO) 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
141644	Other	-	HEALTHLINK
22657	Other	-	BCBS
110221088	Other	-	RAILROAD MEDICARE
201069747	Medicaid	MO	-
2530	Other	-	COX HEALTH SYSTEMS

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 Melvin Walker?

Melvin Walker is registered in NPPES with the primary taxonomy of Internal Medicine 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

Browse all →

Scott Ellis Family Medicine Physician · Springfield, MO NPI 1528100518 St Johns Clinic Inc Durable Medical Equipment & Medical Supplies · Springfield, MO NPI 1871790352 Jennifer Mcguire Primary Care Nurse Practitioner · Springfield, MO NPI 1295071041

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-01-30.