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DR. IVONNE ESTHER HERNANDEZ CASTRO M.D.
NPI 1386136059
Internal Medicine - Endocrinology, Diabetes & Metabolism in Naranjito, PR

Active since May 30, 2018PECOS Enrolled
CARRETERA 164 SECTOR EL DESVIO, NARANJITO, PR 00719(787) 869-1290 Get Directions Write a Review

NPPES record last updated: August 4, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Aug 4, 2026, Jul 28, 2026, Jul 13, 2026 and 5 more (8 updates tracked since 2021).

About Dr. Ivonne Esther Hernandez Castro M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. IVONNE ESTHER HERNANDEZ CASTRO M.D. (NPI 1386136059) is an individual endocrinology, diabetes & metabolism provider in Naranjito, Puerto Rico, licensed in Puerto Rico (23152) and active in the NPI registry since May 2018. She is enrolled in Medicare PECOS and maintains a secondary practice location in Bayamon.

NPPES Registry Identity

NPI1386136059
Entity TypeIndividualFemale
Primary Taxonomy207RE0101X
Provider Legal NameDR. IVONNE ESTHER HERNANDEZ CASTROCredential: M.D.
Location AddressCARRETERA 164 SECTOR EL DESVIONaranjito, PR 00719
Mailing AddressCalle Colorado Y14, Urb Extension De ParkvilleGuaynabo, PR 00969 · (787) 600-4800
Phone(787) 869-1290
Sole ProprietorNo
Enumeration DateMay 30, 2018
Last NPPES UpdateAugust 4, 20268 updates tracked since enumeration
NPPES CertifiedAugust 4, 2026
✔ NPI 1386136059 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Endocrinology, Diabetes & MetabolismAllopathic & Osteopathic Physicians
Taxonomy Code207RE0101X
License✔ Licensed in PR · 23152
Definition
An internist who concentrates on disorders of the internal (endocrine) glands such as the thyroid and adrenal glands. This specialist also deals with disorders such as diabetes, metabolic and nutritional disorders, obesity, pituitary diseases and menstrual and sexual problems.
Also ListedInternal MedicineTaxonomy 207R00000X · License 23-152 (PR)

Secondary Practice Location 1

Location 1100 Ave LaurelBayamon, PR 00956-4816 · Phone (787) 787-5151

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Ivonne Esther Hernandez Castro M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

2

Medicare enrollment records show Ivonne Hernandez Castro reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Nieves Internal Medicine Health
Internal Medicine
100 AVE LUIS MUNOZ MARIN
Caguas, PR 00725
  • Reassigned Medicare billing, Puerto Rico enrollment
  • 12 clinicians in this Medicare group
NPI 1982339057 (787) 653-3108
Salud Integral En La Montana, Inc.
Radiology
CARR 167 KM 17.8, BO. PAJAROS PUERTORRIQUENOS
Bayamon, PR 00961
  • Reassigned Medicare billing, Puerto Rico enrollment
  • 141 clinicians in this Medicare group
NPI 1306327341 (787) 869-5900

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 00719 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$130.65 typical visit price
range $56.86 – $172.44
Typical copayment $32.66 (range $14.21 – $43.11)
Most-billed visit code 99204
Established Patient
$100.24 typical visit price
range $18.24 – $140.44
Typical copayment $25.06 (range $4.56 – $35.11)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 2

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MRS. PATRICIA PANTOJA LND
Nutritionist
CARRETERA 164 SECTOR EL DESVIO
NARANJITO, PR 00719
Naranjito Municipio (787) 869-1290
MARIA ANGELICA GOMEZ-NEGRON
Pharmacist
CARRETERA 164 SECTOR EL DESVIO
NARANJITO, PR 00719
Naranjito Municipio (787) 869-1290

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Ivonne Hernandez Castro's NPI number?

The NPI number for Ivonne Hernandez Castro is 1386136059. It was assigned to this individual provider in the NPPES registry on May 30, 2018.

Where is Ivonne Hernandez Castro located?

Ivonne Hernandez Castro practices at Carretera 164 Sector El Desvio, Naranjito, PR 00719. The listed phone number is (787) 869-1290.

What is Ivonne Hernandez Castro's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Endocrinology, Diabetes & Metabolism, with taxonomy code 207RE0101X.

Is Ivonne Hernandez Castro enrolled in Medicare?

Yes. Ivonne Hernandez Castro is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Ivonne Hernandez Castro's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ivonne Hernandez Castro reassigns Medicare benefits to 2 organizations: Nieves Internal Medicine Health (Caguas, PR) and Salud Integral En La Montana, Inc. (Bayamon, PR). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Ivonne Hernandez Castro's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Ivonne Hernandez Castro was last updated on August 4, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.