DR. MARCEL ALEJANDRO DE DIOS PH.D.
NPI 1649595315
Psychologist in Houston, TX

Active since April 06, 2010PECOS EnrolledAccepts Medicare Assignment
6550 FANNIN STREET, SMITH TOWER, SUITE 1201, HOUSTON, TX 77030(713) 441-3372 Get Directions Write a Review

NPPES record last updated: June 27, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Dr. Marcel Alejandro De Dios Ph.d. NPPES

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

DR. MARCEL ALEJANDRO DE DIOS PH.D. (NPI 1649595315) is an individual psychologist in Houston, Texas, licensed in Texas (36745) and active in the NPI registry since April 2010. He is enrolled in Medicare PECOS and is a graduate of Other (2007).

NPPES Registry Identity

NPI1649595315
Entity TypeIndividualMale
Primary Taxonomy103T00000X
Provider Legal NameDR. MARCEL ALEJANDRO DE DIOSCredential: PH.D.
Location Address6550 FANNIN STREET, SMITH TOWER, SUITE 1201Houston, TX 77030
Mailing Address5139 Jackwood StHouston, TX 77096-1415 · (339) 235-7706
Sole ProprietorYes
Medical School CMSOtherGraduated 2007
Enumeration DateApril 6, 2010
Last NPPES UpdateJune 27, 2025
NPPES CertifiedJune 6, 2025
✔ NPI 1649595315 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychologistBehavioral Health & Social Service Providers
Taxonomy Code103T00000X
License✔ Licensed in TX · 36745
Definition
A psychologist is an individual who is licensed to practice psychology which is defined as the observation, description, evaluation, interpretation, and modification of human behavior by the application of psychological principles, methods, and procedures, for the purpose of preventing or eliminating symptomatic, maladaptive, or undesired behavior and of enhancing interpersonal relationships, work and life adjustment, personal effectiveness, behavioral health, and mental health. The practice of psychology includes, but is not limited to, psychological testing and the evaluation or assessment of personal characteristics, such as intelligence, personality, abilities, interests, aptitudes, and neuropsychological functioning; counseling, psychoanalysis, psychotherapy, hypnosis, biofeedback, and behavior analysis and therapy; diagnosis and treatment of mental and emotional disorder or disability, alcoholism and substance abuse, disorders of habit or conduct, as well as of the psychological aspects of physical illness, accident, injury, or disability; and psycheducational evaluation, therapy, remediation, and consultation. Psychological services may be rendered to individuals, families, groups and the public.
6550 FANNIN STREET, Houston, TX 77030

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. Marcel Alejandro De Dios 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 ID4789179037
PECOS Enrollment IDI20251223004089
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 Marcel De Dios reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Ophthalmology
6550 FANNIN ST, SUITE 447
Houston, TX 77030
  • Reassigned Medicare billing, Texas enrollment
  • 2,407 clinicians in this Medicare group
Otolaryngology
7550 GREENBRIAR DR STE 600
Houston, TX 77030
  • Reassigned Medicare billing, Texas enrollment
  • 1,579 clinicians in this Medicare group

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

Other Providers at the Same Location NPPES 7

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

Specialist
6550 FANNIN STREET, SUITE 2221
HOUSTON, TX 77030
Nurse Practitioner (Adult Health)
6550 FANNIN STREET, SMITH TOWER, SUITE 1901
HOUSTON, TX 77030
Internal Medicine (Gastroenterology)
6550 FANNIN STREET, SMITH TOWER, SUITE 1201
HOUSTON, TX 77030
Registered Nurse (Otorhinolaryngology & Head-Neck)
6550 FANNIN STREET, SUITE 2001
HOUSTON, TX 77030
Internal Medicine
6550 FANNIN STREET, SUITE 2323
HOUSTON, TX 77030
Obstetrics & Gynecology
6550 FANNIN STREET, SUITE 2221
HOUSTON, TX 77030
Nurse Practitioner (Pediatrics)
6550 FANNIN STREET, SUITE 2001
HOUSTON, TX 77030

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 Marcel De Dios's NPI number?

The NPI number for Marcel De Dios is 1649595315. It was assigned to this individual provider in the NPPES registry on April 6, 2010.

Where is Marcel De Dios located?

Marcel De Dios practices at 6550 Fannin Street Smith Tower, Suite 1201, Houston, TX 77030. The listed phone number is (713) 441-3372.

What is Marcel De Dios's specialty?

The primary specialty registered for this NPI is Psychologist with taxonomy code 103T00000X.

Is Marcel De Dios enrolled in Medicare?

Yes. Marcel De Dios 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 organizations bill Medicare for Marcel De Dios's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Marcel De Dios reassigns Medicare benefits to 2 organizations: Tmh Physician Associates PLLC (Houston, TX) and Houston Methodist Specialty Physicians (Houston, TX). 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 Marcel De Dios'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 Marcel De Dios was last updated on June 27, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.