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

Jonathan Romero Casillas, M.D.

Undersea and Hyperbaric Medicine (Emergency Medicine) Physician in Carolina, PR · enumerated 2016 · practices at Ajl Medical Services LLC.

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

National Provider Identifier

1346783420

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Jonathan Romero Casillas

Credential M.D.

Sex Male

Practice address Carolina, PR, 00987

Phone (787) 918-2348

Enumeration date Nov 22, 2016

Last updated in NPPES Apr 6, 2024

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

Taxonomy & licenses

207PE0005X Undersea and Hyperbaric Medicine (Emergency Medicine) Physician Allopathic & Osteopathic Physicians · License 19513 (PR) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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 is the NPI number for Jonathan Romero Casillas?

The National Provider Identifier (NPI) for Jonathan Romero Casillas is 1346783420, a Type 1 (individual) record in the CMS NPPES registry.

Where does Jonathan Romero Casillas practice?

The practice location on file with NPPES is in Carolina, PR. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Ajl Medical Services LLC General Practice Physician · Carolina, PR NPI 1356119754

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-04-06.