FRONTLINE HEALTHCARE ENDOCRINOLOGY LLC
NPI 1538055066
Internal Medicine - Endocrinology, Diabetes & Metabolism in Thousand Oaks, CA

Q: What is Frontline Healthcare Endocrinology LLC's specialty?

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

Active since June 12, 2025

555 MARIN ST STE 120, THOUSAND OAKS, CA 91360(805) 449-1111 Get Directions Write a Review

NPPES record last updated: January 19, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jan 19, 2026, Aug 11, 2025, Jun 12, 2025 (3 updates tracked since 2025).

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About Frontline Healthcare Endocrinology Llc NPPES

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

FRONTLINE HEALTHCARE ENDOCRINOLOGY LLC (NPI 1538055066) is a healthcare organization registered as an endocrinology, diabetes & metabolism in Thousand Oaks, California and active in the NPI registry since June 2025. The organization lists Karen Kim, Md, as its authorized official.

NPPES Registry Identity

NPI1538055066

Entity TypeOrganization

Primary Taxonomy207RE0101X

Legal Business NameFRONTLINE HEALTHCARE ENDOCRINOLOGY LLC

Location Address555 MARIN ST STE 120Thousand Oaks, CA 91360-4102

Mailing Address159 E Huntington Dr Ste 9Arcadia, CA 91006-3225

Phone(805) 449-1111

Organization SubpartNo

Authorized OfficialKaren KimMd · (213) 250-9988

Enumeration DateJune 12, 2025

Last NPPES UpdateJanuary 19, 20263 updates tracked since enumeration

NPPES CertifiedJanuary 19, 2026

✔ NPI 1538055066 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Endocrinology, Diabetes & MetabolismAllopathic & Osteopathic Physicians

Taxonomy Code207RE0101X

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.

555 MARIN ST STE 120, Thousand Oaks, CA 91360

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Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Frontline Healthcare Endocrinology Llc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 2 clinicians reassign Medicare billing to Frontline Healthcare Endocrinology LLC, which bills Medicare for the services they deliver. They are listed nearest first.

Clinicians, nearest first (2)

Michael Robinson, M.D.

Internal Medicine

NPI 1174634513

501 E HARDY ST SUITE 425
Inglewood, CA 90301

(310) 419-4303

✔ PECOS✔ Accepts Medicare35 mi

Karen Kim, M.D.

Internal Medicine

NPI 1548231764

520 S VIRGIL AVE STE 505
Los Angeles, CA 90020

(218) 250-9988

✔ PECOS✔ Accepts Medicare35 mi

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

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 Frontline Healthcare Endocrinology LLC's NPI number?

The NPI number for Frontline Healthcare Endocrinology LLC is 1538055066. It was assigned to this organization in the NPPES registry on June 12, 2025.

Where is Frontline Healthcare Endocrinology LLC located?

Frontline Healthcare Endocrinology LLC is located at 555 Marin St Ste 120, Thousand Oaks, CA 91360. The listed phone number is (805) 449-1111.

What is Frontline Healthcare Endocrinology LLC's specialty?

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

Is Frontline Healthcare Endocrinology LLC enrolled in Medicare?

Yes. Frontline Healthcare Endocrinology LLC is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Frontline Healthcare Endocrinology LLC?

According to the CMS Revalidation Reassignment List (October 2026 release), 2 clinicians, all in Internal Medicine, reassign their Medicare billing to Frontline Healthcare Endocrinology LLC. A 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 the clinician's services. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Frontline Healthcare Endocrinology LLC was last updated on January 19, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.