NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Ralph K Messo Jr., D.O.

Internal Medicine Physician in Staten Island, NY · enumerated 2006.

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

National Provider Identifier

1255309175

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Registry record

Entity type Individual (Type 1)
Name Dr. Ralph K Messo Jr.
Credential D.O.
Sex Male
Practice address Staten Island, NY, 10312
Phone (718) 966-5556
Fax (718) 966-7483
Enumeration date Mar 8, 2006
Last updated in NPPES Sep 5, 2007

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 184376 (NY) Primary
208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License 184376 (NY) 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
0401475 Other NY UNITED HEALTHCARE
NYM184376 Other NY OXFORD MEDICARE
OP235 Other NY OXFORD HEALTH PLANS
13418106800 Other NY TOUCHSTONE HEALTH PSO
01460282 Medicaid NY -
4566381 Other NY AETNA
HEALTHNET Other NY 1P0525
040184376NY02 Other NY ANTHEM HEALTH NETWORK
MR4376 Other NY ATLANTIS HEALTH PLAN
184376 Other NY HIP
0451877 Other NY AETNA/USHC
162158 Other NY ELDERPLAN
1P0065 Other NY TOUCHSTONE HEALTH PARTNER
129AS1 Other NJ EMPIRE BC/BS
17G412 Other NY EMPIRE BC/BS
2698319 Other NY GHI
Y044934 Other NY CHAMPUS

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 NPI 1255309175 active?
Yes, as of the latest NPPES snapshot, NPI 1255309175 is active (record last updated 2007-09-05).
How do I verify Ralph Messo's NPI record?
Cross-check NPI 1255309175 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-09-05.