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DR. WARREN ROSS LOOS PH.D.
NPI 1548360167
Psychologist - Clinical in Honolulu, HI

Active since September 24, 2006PECOS EnrolledAccepts Medicare Assignment
4300 WAIALAE AVE APT B1002, HONOLULU, HI 96816(808) 284-2200(888) 668-8527 Get Directions Write a Review

NPPES record last updated: July 26, 2022. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Dr. Warren Ross Loos Ph.d. NPPES

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

DR. WARREN ROSS LOOS PH.D. (NPI 1548360167) is an individual clinical provider in Honolulu, Hawaii, licensed in Hawaii (PSY-792) and active in the NPI registry since September 2006. He is enrolled in Medicare PECOS and is a graduate of Other (1988).

NPPES Registry Identity

NPI1548360167
Entity TypeIndividualMale
Primary Taxonomy103TC0700X
Provider Legal NameDR. WARREN ROSS LOOSCredential: PH.D.
Location Address4300 WAIALAE AVE APT B1002Honolulu, HI 96816-5757
Mailing Address4348 Waialae Ave # 403Honolulu, HI 96816-5767 · (808) 284-2200 · Fax (888) 668-8527
Phone(808) 284-2200
Fax(888) 668-8527
Sole ProprietorYes
Medical School CMSOtherGraduated 1988
Enumeration DateSeptember 24, 2006
Last NPPES UpdateJuly 26, 2022
NPPES CertifiedJuly 26, 2022
✔ NPI 1548360167 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychologist · ClinicalBehavioral Health & Social Service Providers
Taxonomy Code103TC0700X
License✔ Licensed in HI · PSY-792
Definition
A psychologist who provides continuing and comprehensive mental and behavioral health care for individuals and families; consultation to agencies and communities; training, education and supervision; and research-based practice. It is a specialty in breadth -- one that is broadly inclusive of severe psychopathology -- and marked by comprehensiveness and integration of knowledge and skill from a broad array of disciplines within and outside of psychology proper. The scope of clinical psychology encompasses all ages, multiple diversities and varied systems.
4300 WAIALAE AVE APT B1002, Honolulu, HI 96816
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Other Identifiers 3

Other232967HI · Hmsa
Other203822633HI · Tricare
Medicaid54463601HI

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include HMSA.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Warren Ross Loos Ph.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID4981507720
PECOS Enrollment IDI20040217000950
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 Reassignment

Medicare enrollment records show Warren Loos reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Warren R. Loos, Ph.D, LLC
5.2 mi
Community/Behavioral Health
1188 BISHOP ST, SUITE 1208
Honolulu, HI 96813
  • Reassigned Medicare billing, Hawaii enrollment
  • Medicare enrollment name: Warren R Loos Phd LLC
NPI 1396908604 (808) 734-2897

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 96816 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
$180.05 typical visit price
range $60.53 – $180.05
Typical copayment $45.01 (range $15.13 – $45.01)
Most-billed visit code 99205
Established Patient
$105.65 typical visit price
range $20.09 – $147.56
Typical copayment $26.41 (range $5.02 – $36.89)
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

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

DR. CLAUDETTE HARUKO OZOA PH.D.
Psychologist (Clinical)
4300 WAIALAE AVE APT B1002
HONOLULU, HI 96816
Honolulu County (808) 284-3601

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 Warren Loos's NPI number?

The NPI number for Warren Loos is 1548360167. It was assigned to this individual provider in the NPPES registry on September 24, 2006.

Where is Warren Loos located?

Warren Loos practices at 4300 Waialae Ave Apt B1002, Honolulu, HI 96816. The listed phone number is (808) 284-2200.

What is Warren Loos's specialty?

The primary specialty registered for this NPI is Psychologist, specializing in Clinical, with taxonomy code 103TC0700X.

Is Warren Loos enrolled in Medicare?

Yes. Warren Loos is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for Warren Loos's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Warren Loos reassigns Medicare benefits to Warren R. Loos, Ph.D, LLC (Honolulu, HI). The 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 Warren Loos's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Warren Loos accept?

Health plans from HMSA list Warren Loos as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Warren Loos was last updated on July 26, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years 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.