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Colon & Rectal Surgery Specialists in Houston, TX

Browse 41 Colon & Rectal Surgery providers listed in NPPES with a practice address in Houston, Texas.

41 Healthcare Providers

How Houston compares with the U.S.

Houston has 1.8 clinicians in Colon & Rectal Surgery per 100,000 residents, 2.5 times the U.S. rate of 0.7.

That is 41 active clinicians in Colon & Rectal Surgery with a practice address in Houston, for a population of 2,328,253.

The Texas rate is 0.7 per 100,000 residents.

What these numbers mean

Clinicians per 100,000 residents compares places of different sizes. We count active clinicians who list a practice address in the area in the federal NPI registry (NPPES) and divide by the number of people who live there, according to the U.S. Census Bureau. The U.S. rate is the same calculation for the whole country.

A higher number does not mean it is easier to get an appointment, that wait times are shorter, or that care is better. It also does not show how many clinicians are accepting new patients or which insurance plans they take. A lower number does not by itself mean there is a shortage.

City counts use the city name in each clinician's practice address. That postal city can cover a larger or smaller area than the city limits the Census Bureau uses for population, and many clinicians list only one address even if they work in several places. Cities with hospitals or large medical centers often list more specialists than the number of residents alone would suggest, because patients also come from nearby areas.

97% of clinicians in Colon & Rectal Surgery in Houston listed in the CMS Medicare file (36 of 37) accept Medicare assignment. That is similar to the Texas share of 98%.

What is Medicare assignment?

A clinician who accepts Medicare assignment agrees to take the Medicare-approved amount as full payment for services that Original Medicare covers. You usually still pay your deductible and coinsurance. This comes from the CMS Doctors and Clinicians file and applies to Original Medicare only. Medicare Advantage plans have their own provider networks. It does not show whether a clinician is taking new patients.

Some clinicians are listed as "may accept assignment," which means they can decide case by case. Clinicians without an assignment flag, or who are not in the CMS file, are not counted as accepting assignment. That does not mean they refuse Medicare. Ask the office before your visit.

41% of clinicians in Colon & Rectal Surgery in Houston listed in the CMS Medicare file (15 of 37) have a CMS telehealth indicator, meaning their recent Medicare claims include telehealth services. That is higher than the Texas share of 33%.

About the telehealth indicator

The telehealth indicator comes from CMS. It marks clinicians whose recent paid Medicare claims include services delivered by telehealth. It means a clinician has provided some services by telehealth, not that every visit can be done online. A clinician without the indicator may still offer telehealth, for example to patients who are not on Medicare. Ask the office which visits can be done by video or phone.

These figures summarize public federal data. They do not measure quality of care, appointment availability, or whether a clinician accepts your insurance or new patients. Registry addresses can be out of date. Please confirm details directly with the office and your plan. This information is not medical advice.

Prepared by T-MedInfo from NPPES, CMS and U.S. Census Bureau data. Questions or corrections: support@true-medinfo.com ยท Methodology

Sources: Clinician counts and practice addresses: NPPES NPI Registry, Centers for Medicare & Medicaid Services (CMS), data as of August 2026. Medicare assignment and telehealth indicators: CMS Doctors and Clinicians National Downloadable File. Population: U.S. Census Bureau, American Community Survey 2020-2024 5-Year Estimates, Table B01003 (Total Population).

Colon & Rectal Surgery Medicare (PECOS) Enrollment & Ordering Eligibility

Medicare enrollment and order/referring eligibility listed by CMS for Colon & Rectal Surgery practitioners in Houston, TX

Source: CMS PECOS
PECOS Enrolled Specialists 38 In Houston, TX
Part B Lab & Imaging Eligible 38 Diagnostic Referrals
DME Ordering Eligible 38 Durable Medical Equipment
Home Health Agency Referrals 38 HHA Ordering Eligible
Showing 1โ€“20 of 41 providers
With recent CMS data first, then Aโ€“Z

Dr. Ronald Wanki Ngwa Ambe , MD

Colon & Rectal Surgery

Active NPI Status Accepts Medicare Assignment
1324 N Shepherd Dr Ste 100, Houston, TX 770083096
Phone: 8322320500
NPI Identifier 1063688711
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Dr. Erik Paul Askenasy , MD

Colon & Rectal Surgery

Active NPI Status Accepts Medicare Assignment
6550 Fannin St Ste 2307, Houston, TX 770302723
Phone: 7134864600
NPI Identifier 1780813295
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Dr. H Randolph Bailey , MD

Colon & Rectal Surgery

Active NPI Status
6550 Fannin St, Ste 2307, Houston, TX 770302717
Phone: 7137909250
NPI Identifier 1386631505
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Dr. Joseph R Cali , MD

Colon & Rectal Surgery

Active NPI Status Accepts Medicare Assignment
915 Gessner Rd Ste 725, Houston, TX 770242559
Phone: 7134641758
NPI Identifier 1871504225
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Dr. George J. Chang , MD

Colon & Rectal Surgery

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
1515 Holcombe Blvd, Houston, TX 770304000
Phone: 7137926161
NPI Identifier 1295820496
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Dr. Lisa Chen , MD

Colon & Rectal Surgery

Active NPI Status Accepts Medicare Assignment
800 Peakwood Dr, Suite 2c, Houston, TX 770902900
Phone: 2814407495
NPI Identifier 1508879669
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Stephen Chiang

Colon & Rectal Surgery

Active NPI Status Accepts Medicare Assignment
12121 Richmond Ave Ste 115, Houston, TX 770822420
Phone: 8322203016
NPI Identifier 1194102988
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Dr. Joshua Charles Coursey , MD

Colon & Rectal Surgery

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
6550 Fannin St, Suite 1404, Houston, TX 770302717
Phone: 7137900600
NPI Identifier 1184944019
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Dr. Marianne Vandromme Cusick , MD, MSPH

Colon & Rectal Surgery

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
6550 Fannin St, Suite 2307, Houston, TX 770302717
Phone: 7134864600
NPI Identifier 1033323878
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Dr. Rachel Joy Ellsworth , MD

Colon & Rectal Surgery

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
18400 Katy Fwy, Suite 560, Houston, TX 770941286
Phone: 8325223240
NPI Identifier 1336393479
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Dr. Aakash Hasu Gajjar , MD

Colon & Rectal Surgery

Active NPI Status
7789 Southwest Fwy Ste 300, Houston, TX 770741832
Phone: 2819947403
NPI Identifier 1730115106
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Dr. Kelly Gilmore , MD

Colon & Rectal Surgery

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
6550 Fannin St, Ste 2307, Houston, TX 770302717
Phone: 7137909250
NPI Identifier 1962697417
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Dr. Eric M Haas , MD

Colon & Rectal Surgery

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
6560 Fannin St, Suite 1401, Houston, TX 770302761
Phone: 7134415155
NPI Identifier 1275501603
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Dr. Atif Iqbal , MD

Colon & Rectal Surgery

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
7200 Cambridge St Fl 7, Houston, TX 77030
Phone: 7137984321
NPI Identifier 1841398138
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Dr. Tareq Qasem Kamal , MD

Colon & Rectal Surgery

Active NPI Status Accepts Medicare Assignment
18400 Katy Fwy Ste 560, Houston, TX 770941294
Phone: 8325223240
NPI Identifier 1871808949
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Dr. Konya K. Keeling-Johnson , MD

Colon & Rectal Surgery

Active NPI Status Accepts Medicare Assignment
6565 Fannin St, Houston, TX 770302703
Phone: 7133639936
NPI Identifier 1588821565
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Dr. Justin Taehwan Kim , MD

Colon & Rectal Surgery

Active NPI Status Accepts Medicare Assignment
7500 Kirby Dr, #1523, Houston, TX 770304300
Phone: 2819040144
NPI Identifier 1043489248
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Dr. Jean A. Knapps , MD

Colon & Rectal Surgery

Active NPI Status Accepts Medicare Assignment
1125 Cypress Station Dr Ste G-3, Houston, TX 770903055
Phone: 8158313002
NPI Identifier 1851559728
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Dr. Tsuyoshi Konishi , MD, PhD

Colon & Rectal Surgery

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
1515 Holcombe Blvd, Houston, TX 770304000
Phone: 7137926161
NPI Identifier 1033740683
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Dr. Robert Kress , DO

Colon & Rectal Surgery

Active NPI Status Accepts Medicare Assignment
6410 Fannin St Ste 1400, Houston, TX 770305389
Phone: 8323257125
NPI Identifier 1083068803
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Frequently Asked Questions about Colon & Rectal Surgery in Houston

How do I check a Colon & Rectal Surgery practitioner's license?

Each practitioner profile shows the NUCC taxonomy code and any state license number the practitioner reported to NPPES, plus a link to the Texas licensing board lookup. NPPES entries are self-reported; current license status is published only by the state board.

Why is a practitioner missing from this list?

This list shows NPI records that are active in NPPES. A deactivated NPI keeps its profile with the deactivation date and practice history; find it with the site search by name or NPI number.