Independent US Healthcare Provider Directory & Public Medical Database Patient Guides

Dr. Mark R Matthews , MD

Pathology - Anatomic Pathology โ€ข Houston, TX

Active NPI 1083694418 Individual Practitioner Male Practitioner Accepts Medicare assignment
Practice location in NPPES

4131 Directors Row
Houston, TX 770928703

Call 8776972447 Location details and other listings
Medical Disclaimer

This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.

Practice Location & Contact Primary Location

Practice Address

4131 Directors Row

Houston, TX 770928703

Telephone 8776972447
Fax 8556972447
Organization at the Same NPPES Address or Phone
Pathology Biomedical Consulting, Inc. Facility NPI 1679648273

Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.

Other Listings in Public Data

CMS Doctors and Clinicians lists 1 group name: Sagis Pllc. See the list

Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026.

Listings do not confirm current availability, employment or a shared ownership network.

Medicare Profile & Education

Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026

Medical School

Medical College Of Georgia School Of Medicine

Graduation Year

1994

Medicare patients

5,673 people with Original Medicare in 2024

Different Original Medicare patients in 2024; counts below 11 are hidden; this does not show availability or quality.

Source: CMS, Medicare Physician & Other Practitioners โ€“ by Provider, 2024.

Medicare-allowed amount

About $611,602 in 2024

The total amount Medicare approved for these services in 2024. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.

What this does not show: Medicare-allowed amount

This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.

Source: CMS, Medicare Physician & Other Practitioners โ€“ by Provider and Service, 2024.

Paid by Medicare

About $463,099 in 2024

The part of the Medicare-allowed amount that Medicare itself paid in 2024, after patients' deductibles and coinsurance.

What this does not show: Paid by Medicare

This is not the clinician's income and not a measure of quality.

Source: CMS, Medicare Physician & Other Practitioners โ€“ by Provider and Service, 2024.

Industry payments (Open Payments)

Fewer than 11 payment records totaling $86.50 in 2021

Drug and medical device companies must report certain payments to doctors and some other clinicians to CMS, such as meals, travel, speaking fees or research funding.

These records are submitted by drug and medical device companies, and a reported payment does not necessarily mean the financial relationship is improper.

General: payments not tied to research, such as meals, travel, consulting or speaking fees.

A reported payment does not necessarily mean the financial relationship is improper. Research payments can go to a hospital or university for a study the clinician leads, not to the clinician personally. Clinicians can dispute records with the company that reported them.

Source: CMS Open Payments, program year 2021.

Guide: How to read an Open Payments record

Years since graduation

32 years (graduated 1994)

CMS Doctors and Clinicians data list 1994 as the year this clinician finished professional school.

What this does not show: Years since graduation

It is not the number of years in practice, and more years does not mean better care.

Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026.

NPI first issued

2006

The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.

What this does not show: NPI first issued

NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.

Source: CMS NPPES NPI Registry.

Accepts Medicare assignment

CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.

Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.

Source: CMS Doctors and Clinicians, CMS release of October 2, 2026; Medicare.gov, โ€œDoes your provider accept Medicare as full payment?โ€

Guide: What Medicare assignment means

No telehealth indicator

CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.

Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians, CMS release of October 2, 2026.

Guide: How Medicare covers telehealth

Enrolled in Medicare (PECOS)

Dr. Matthews has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.

It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.

Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.

Guide: What Medicare enrollment (PECOS) means

Can order Medicare-covered services

CMS lists Dr. Matthews as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.

What this does not show: Can order Medicare-covered services

It does not mean the clinician offers these services directly.

Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.

Guide: What ordering and referring status means

Compared with the same specialty in Houston and Texas

Billing and prescribing volume is not a quality rating.

Medicare Part B services

More Medicare Part B services than 95% of clinicians listed under Pathology - Anatomic Pathology in Houston, TX (2024, 43 clinicians with data). Median for this group: 764. Middle half: 390 to 1,685.

More Medicare Part B services than 95% of clinicians listed under Pathology - Anatomic Pathology in Texas (2024, 87 clinicians with data). Median for this group: 938. Middle half: 500 to 1,689.

Medicare-allowed amount

A higher Medicare-allowed amount than 95% of clinicians listed under Pathology - Anatomic Pathology in Houston, TX (2024, 43 clinicians with data). Median for this group: $35,315. Middle half: $14,620 to $72,181.

A higher Medicare-allowed amount than 95% of clinicians listed under Pathology - Anatomic Pathology in Texas (2024, 87 clinicians with data). Median for this group: $39,189. Middle half: $19,033 to $72,181.

Paid by Medicare

A higher Medicare payment amount than 95% of clinicians listed under Pathology - Anatomic Pathology in Houston, TX (2024, 43 clinicians with data). Median for this group: $27,550. Middle half: $11,252 to $56,143.

A higher Medicare payment amount than 95% of clinicians listed under Pathology - Anatomic Pathology in Texas (2024, 87 clinicians with data). Median for this group: $30,746. Middle half: $15,002 to $56,143.

65 active clinicians are listed under Pathology - Anatomic Pathology with a practice address in Houston, TX (158 in Texas).

Addresses are self-reported to NPPES and may be out of date.

Telehealth indicator in Houston

0% of these 65 clinicians have the CMS telehealth indicator.

64.6% of these 65 clinicians are listed by CMS as accepting Medicare assignment.

Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Open Payments (2021), CMS Doctors and Clinicians, CMS release of October 2, 2026, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.

Text: T-MedInfo ยท Report an error.

Pharma & Medical Device Financial Disclosures

Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments

Open Payments ยท Program Year 2021
Disclosure Year:

Program year 2021 (payments made January 1 โ€“ December 31, 2021): fewer than 11 records totaling $86.50.

Manufacturer Payment Nature Product Type Amount ($)
TerSera Therapeutics LLC
Food and Beverage
In-kind items and services
Quzyttir General $86.50

Source: CMS Open Payments, program year 2021, released June 30, 2026.

Performed Procedures & Service Volume

Services billed to Original Medicare Part B in 2024.

CMS Part B ยท Data Year 2024
Reporting Year:

CPTยฎ is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016โ€“2023 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners โ€“ by Provider and Service data, 2017โ€“2024; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.

HCPCS Code Services Patients Submitted Charge Medicare Allowed
88305 Pathology examination of tissue using a microscope, intermediate complexity
8,067 5,440 $339.98 $60.32
88341 Special stained specimen slides to examine tissue, each additional procedure
661 258 $272.13 $78.12
88342 Special stained specimen slides to examine tissue, initial procedure
336 297 $316.25 $87.92
88304 Pathology examination of tissue using a microscope, moderately low complexity
249 224 $243.31 $35.81
88312 Special stained specimen slides to identify organisms including interpretation and report
117 89 $186.97 $97.64
88350 Antibody evaluation, each additional single antibody stain procedure
112 28 $180.00 $106.66
88325 Surgical pathology consultation and report, comprehensive
49 49 $567.00 $147.96
88346 Antibody evaluation, initial single antibody stain procedure
28 28 $312.00 $140.28
88311 Preparation of tissue for examination by removing any calcium present
19 18 $62.68 $18.81

Source: CMS Part B by Provider and Service, 2024; services under 11 beneficiaries omitted by CMS. Privacy limits

Submitted charges are billed amounts, not a price quote for your visit.

Specialties & License Numbers Reported to NPPES

Self-certified to NPPES: 2023-04-19
Pathology - Anatomic Pathology Primary Specialty

NUCC Taxonomy Code: 207ZP0101X

License # reported to NPPES TX L0403

A pathologist deals with the causes and nature of disease and contributes to diagnosis, prognosis and treatment through knowledge gained by the laboratory application of the biologic, chemical and physical sciences. A pathologist uses information gathered from the microscopic examination of tissue specimens, cells and body fluids, and from clinical laboratory tests on body fluids and secretions for the diagnosis, exclusion and monitoring of disease.

Pathology - Pediatric Pathology

NUCC Taxonomy Code: 207ZP0213X

License # reported to NPPES TX L0403

A pediatric pathologist is expert in the laboratory diagnosis of diseases that occur during fetal growth, infancy and child development. The practice requires a strong foundation in general pathology and substantial understanding of normal growth and development, along with extensive knowledge of pediatric medicine.

Pathology - Dermatopathology

NUCC Taxonomy Code: 207ZD0900X

License # reported to NPPES TX L0403

A dermatopathologist is an expert in diagnosing and monitoring diseases of the skin including infectious, immunologic, degenerative, and neoplastic diseases. This entails the examination and interpretation of specially prepared tissue sections, cellular scrapings, and smears of skin lesions by means of light microscopy, electron microscopy, and fluorescence microscopy.

Check License Status with the State Board License numbers are self-reported to NPPES; T-MedInfo does not confirm them against state records. Current status: Texas Medical Board.
Look Up on State Board Site

Medicare (PECOS) Enrollment & Ordering Eligibility

Source: CMS PECOS
Medicare FFS Enrollment Status Medicare Enrollment on File
CMS Provider Specialty

PRACTITIONER - PATHOLOGY

Medicare Enrollment ID

I20050607000344

Enrollment State Jurisdiction

TX

PECOS Control ID

2860435245

Medicare Order & Referring Eligibility
Clinical Lab & Imaging (Part B) Eligible
Durable Medical Equipment (DME) Eligible
Home Health Agency (HHA) Eligible
Power Mobility Devices (PMD) Eligible

Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.

Medicare Group Practice Enrollments

Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026

Sagis Pllc

1033 La Posada Dr, Austin, TX 787523824

Phone: 8776972447

Sagis Pllc

4131 Directors Row, Houston, TX 770928703

Phone: 8776972447

Sagis Pllc

4582 N 1st Ave, Tucson, AZ 857188603

Phone: 8776972447

Clinicians Sharing This Practice Address or Phone

Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.

10 listed
Dr. Nicole Bender , MD

Dermatology - Dermatopathology

NPI 1134515752

Doctor of Medicine (M.D.)

Dr. Nyasha Bullock , MD

Pathology - Anatomic Pathology & Clinical Pathology

NPI 1932337631

Doctor of Medicine (M.D.)

Dr. John Cangelosi , MD

Pathology - Anatomic Pathology & Clinical Pathology

NPI 1831393438

Doctor of Medicine (M.D.)

Dr. Jason Gregorio , MD

Pathology - Anatomic Pathology & Clinical Pathology

NPI 1467643643

Doctor of Medicine (M.D.)

Dr. Keagan Lee , MD

Pathology - Anatomic Pathology & Clinical Pathology

NPI 1750540613

Doctor of Medicine (M.D.)

Dr. Howard Martin , MD

Pathology - Dermatopathology

NPI 1366421927

Doctor of Medicine (M.D.)

Career & Practice History Timeline

Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status

15 Historical Events
๐Ÿ“
Updated Practice Location April 19, 2023

Registered at 4131 DIRECTORS ROW, HOUSTON, TX 770928703 (Tel: 8776972447)

๐Ÿ“
Updated Business Mailing Address April 19, 2023

Registered at 4131 DIRECTORS ROW, HOUSTON, TX 770928703 (Tel: 8776972447)

๐Ÿ‘ค
Provider Name / Credentials Updated April 19, 2023

Recorded as MARK MATTHEWS, M.D.

๐ŸŽ“
Medical Taxonomy / Specialty Registered (Primary Specialty) April 19, 2023

Pathology (license number reported to NPPES: TX L0403)

โœ…
NPI Profile Active March 22, 2018

NPI status registered as active in NPPES database

๐Ÿ“
Updated Practice Location March 22, 2018

Registered at 6655 N MACARTHUR BLVD, IRVING, TX 750392443 (Tel: 2142778700)

๐Ÿ“
Updated Business Mailing Address March 22, 2018

Registered at PO BOX 840294, DALLAS, TX 752840294

๐Ÿ‘ค
Provider Name / Credentials Updated March 22, 2018

Recorded as MARK MATTHEWS, MD

๐ŸŽ“
Medical Taxonomy / Specialty Registered (Primary Specialty) March 22, 2018

Pathology (license number reported to NPPES: TX L0403)

โœ…
NPI Profile Active June 26, 2008

NPI status registered as active in NPPES database

๐Ÿ“
Practice Location (Initial Record) June 26, 2008

Registered at 9600 DATAPOINT DR, SAN ANTONIO, TX 782292028 (Tel: 2108923754)

๐Ÿ“
Business Mailing Address (Initial Record) June 26, 2008

Registered at 19743 WITTENBURG, SAN ANTONIO, TX 782562108 (Tel: 2106989690)

๐Ÿ‘ค
Provider Name / Credentials (Initial Record) June 26, 2008

Recorded as MARK MATTHEWS, MD

๐ŸŽ“
Medical Taxonomy / Specialty Registered (Primary Specialty) June 26, 2008

Pathology (license number reported to NPPES: TX L0403)

๐ŸŸข
Initial NPI Registration & Enumeration January 20, 2006

First registered as active Individual Practitioner in NPPES Database.

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NPI Administrative Meta

NPI Number: 1083694418
Entity Type:
Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)
Enumeration Date: January 20, 2006
Last Update: April 19, 2023
Sole Proprietor: No

Other Pathology - Anatomic Pathology Specialists in Houston

All Pathology - Anatomic Pathology Specialists in Houston

Mailing Address

4131 Directors Row

Houston, TX 770928703

Phone: 8776972447

About This Data NPPES fields (address, phone, specialty, license) are self-reported and may be outdated; Medicare fields follow the CMS dataset named in each section. Correct directly at NPPES.