Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Castlling LLC

Q: What type of organization is Castlling LLC?

Castlling LLC is registered in NPPES as a Emergency Medical Services (Emergency Medicine) Physician (its primary provider taxonomy).

Emergency Medical Services (Emergency Medicine) Physician in San Juan, PR · enumerated 2025 · authorized official Ubaldo Santiago, President.

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

National Provider Identifier

1043017163

Verified

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Registry record

Entity type Organization (Type 2)

Legal business name Castlling LLC

Practice address 1304 Calle Wilson Apt 8s, San Juan, PR, 00907

Phone (787) 722-2371

Fax (787) 722-2374

Enumeration date Feb 26, 2025

Last updated in NPPES Feb 26, 2025

Taxonomy & classification

207PE0004X Emergency Medical Services (Emergency Medicine) Physician Allopathic & Osteopathic Physicians Primary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians Secondary

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians Secondary

208D00000X General Practice Physician Allopathic & Osteopathic Physicians Secondary

208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians Secondary

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers Secondary

363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers Secondary

Authorized official

Name Ubaldo Santiago

Title President

Phone (787) 536-2033

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 type of organization is Castlling LLC?

Castlling LLC is registered in NPPES as a Emergency Medical Services (Emergency Medicine) Physician (its primary provider taxonomy).

What is a Type 2 NPI?

A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.

Providers at this address

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Alquimia Services LLC Emergency Medical Services (Emergency Medicine) Physician · San Juan, PR NPI 1245044650

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-02-26.