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Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

John L Elfervig, M.D.

Retina Specialist (Ophthalmology) Physician in Memphis, TN · enumerated 2006.

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

National Provider Identifier

1619910544

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Registry record

Entity type Individual (Type 1)
Name John L Elfervig
Credential M.D.
Sex Male
Practice address 825 Ridge Lake Blvd, Memphis, TN, 38120
Phone (901) 685-2200
Fax (901) 820-2342
Enumeration date Jun 14, 2006
Last updated in NPPES Jan 15, 2018

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License MD009929 (TN) Secondary
207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License R4424 (AR) Secondary
207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 14866 (MS) Secondary
207WX0107X Retina Specialist (Ophthalmology) Physician Allopathic & Osteopathic Physicians · License 14866 (MS) Secondary
207WX0107X Retina Specialist (Ophthalmology) Physician Allopathic & Osteopathic Physicians · License R4424 (AR) Secondary
207WX0107X Retina Specialist (Ophthalmology) Physician Allopathic & Osteopathic Physicians · License 9929 (TN) 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
P00658339 Other MS PALMETTO RR MEDICARE
180024050 Other TN PALMETTO RR MEDICARE
00115592 Medicaid MS -
107447001 Medicaid AR -
3190249 Medicaid TN -
202004503 Medicaid MO -

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

How do I verify John Elfervig's NPI record?
Cross-check NPI 1619910544 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1619910544 active?
Yes, as of the latest NPPES snapshot, NPI 1619910544 is active (record last updated 2018-01-15).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-01-15.