Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Vallikantha Nellaiappan, M.D

Endocrinology, Diabetes & Metabolism Physician in Greenfield, WI · enumerated 2011.

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

National Provider Identifier

1548557812

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Registry record

Entity type Individual (Type 1)

Name Vallikantha Nellaiappan

Credential M.D

Sex Female

Practice address 4448 W Loomis Rd, Greenfield, WI, 53220

Phone (414) 281-5150

Enumeration date Jul 6, 2011

Last updated in NPPES Oct 26, 2023

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 125059624 (IL) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 35.139412 (OH) Secondary

207RE0101X Endocrinology, Diabetes & Metabolism Physician Allopathic & Osteopathic Physicians · License 01077589A (IN) Secondary

207RE0101X Endocrinology, Diabetes & Metabolism Physician Allopathic & Osteopathic Physicians · License 35.139412 (OH) Secondary

207RE0101X Endocrinology, Diabetes & Metabolism Physician Allopathic & Osteopathic Physicians · License 101005 (WI) 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
0418021	Medicaid	OH	-
100249522	Medicaid	WI	-

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 Vallikantha Nellaiappan?

Vallikantha Nellaiappan is registered in NPPES with the primary taxonomy of Endocrinology, Diabetes & Metabolism 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.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-10-26.