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DR. COLVILLE T. WILLIAMS
NPI 1861490005
Internal Medicine - Nephrology in Houston, TX

Active since July 12, 2005PECOS EnrolledAccepts Medicare Assignment
915 GESSNER RD STE 360, HOUSTON, TX 77024(713) 468-5440(713) 973-0778 Get Directions Write a Review

NPPES record last updated: October 29, 2025. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Dr. Colville T. Williams NPPES

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

DR. COLVILLE T. WILLIAMS (NPI 1861490005) is an individual nephrology provider in Houston, Texas, licensed in Texas (J8419) and active in the NPI registry since July 2005. He is enrolled in Medicare PECOS, is affiliated with Hca Houston Healthcare Kingwood, and maintains 3 additional practice locations.

NPPES Registry Identity

NPI1861490005
Entity TypeIndividualMale
Primary Taxonomy207RN0300X
Provider Legal NameDR. COLVILLE T. WILLIAMS
Location Address915 GESSNER RD STE 360Houston, TX 77024-2540
Mailing Address915 Gessner Rd Ste 360Houston, TX 77024-2540 · (713) 468-5440 · Fax (713) 973-0778
Phone(713) 468-5440
Fax(713) 973-0778
Sole ProprietorNo
Medical School CMSUniversity Of Texas Medical School At HoustonGraduated 1995
Enumeration DateJuly 12, 2005
Last NPPES UpdateOctober 29, 2025
NPPES CertifiedOctober 29, 2025
✔ NPI 1861490005 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · NephrologyAllopathic & Osteopathic Physicians
Taxonomy Code207RN0300X
License✔ Licensed in TX · J8419
Definition
An internist who treats disorders of the kidney, high blood pressure, fluid and mineral balance and dialysis of body wastes when the kidneys do not function. This specialist consults with surgeons about kidney transplantation.
915 GESSNER RD STE 360, Houston, TX 77024
Open in Google Maps ↗

Secondary Practice Locations 3

Location 113219 Dotson Rd Ste 200Houston, TX 77070-4308 · Phone (281) 571-8090 · Fax (281) 571-8095
Location 21331 W Grand Pkwy N Ste 320Katy, TX 77493-2711 · Phone (713) 468-5440 · Fax (713) 973-0778
Location 310425 Huffmeister Rd Ste 420Houston, TX 77065-3429 · Phone (281) 571-8090 · Fax (281) 571-8095

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross and Blue Shield of Texas, Community Health Choice, WellPoint.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Colville T. Williams 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 ID3375559222
PECOS Enrollment IDI20060301000540
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.

Areas of Expertise CMS Part B claims 6

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
280 services84 patients
Dialysis services, 4 or more physician visits per month (20 years or older) 90960
Dialysis is a treatment that filters and purifies your blood using a machine. It helps keep your fluids and electrolytes in balance when the kidneys can't do their job. This service includes 4 or more visits per month with a physician to monitor your health and adjust your treatment as needed.
185 services31 patients
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
78 services38 patients
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222
Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.
57 services48 patients
Hemodialysis procedure with physician evaluation 90935
Hemodialysis is a treatment that uses a machine to filter waste and excess fluid from your blood when your kidneys can't. A physician checks your health before, during, and after the procedure to ensure it's working effectively for you.
19 services12 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
17 services17 patients

Hospital Affiliations CMS Care Compare 4

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Hca Houston Healthcare Kingwood

Acute Care Hospitals · Kingwood, TX
3/5 CMS rating
OwnershipProprietary
CMS Certification Number450775
Location22999 Us Hwy 59Kingwood, TX 77325 · Harris County
Emergency services Birthing friendly

Houston Methodist Willowbrook Hospital

Acute Care Hospitals · Houston, TX
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number450844
Location18220 State Highway 249Houston, TX 77070 · Harris County
Emergency services Birthing friendly

St Luke's Hospital At The Vintage

Acute Care Hospitals · Houston, TX
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number670075
Location20171 Chasewood Park DriveHouston, TX 77070 · Harris County
Emergency services

Houston Methodist West Hospital

Acute Care Hospitals · Houston, TX
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number670077
Location18500 Katy FreewayHouston, TX 77094 · Harris County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 77024 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
$134.06 typical visit price
range $58.24 – $176.98
Typical copayment $33.51 (range $14.56 – $44.24)
Most-billed visit code 99204
Established Patient
$102.71 typical visit price
range $18.60 – $143.93
Typical copayment $25.67 (range $4.65 – $35.98)
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.

Referred Medical Equipment & Supplies CMS DME claims

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Pharmacy supply fee for oral anti-cancer, oral anti-emetic or immunosuppressive drug(s); for a subsequent prescription in a 30-day period Q0512
Treatment-Chemotherapy · category RH012N
1 supplier18 claims18 services$12.61 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 9

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

HOUSTON NEPHROLOGY GROUP, P.A.
Internal Medicine (Nephrology)
915 GESSNER RD STE 360
HOUSTON, TX 77024
Harris County (713) 468-5440
MASOOD MAHMOOD M.D
Internal Medicine (Nephrology)
915 GESSNER RD STE 360
HOUSTON, TX 77024
Harris County (713) 468-5440
JOANNE S BRUNELLE HINDLET APRN,BC
Nurse Practitioner (Acute Care)
915 GESSNER RD STE 360
HOUSTON, TX 77024
Harris County (712) 468-5440
ESTHER LIFAFE FNP-BC
Nurse Practitioner (Family)
915 GESSNER RD STE 360
HOUSTON, TX 77024
Harris County (713) 468-5440
MS. MONICA GUIDRY FNP
Nurse Practitioner (Family)
915 GESSNER RD STE 360
HOUSTON, TX 77024
Harris County (713) 468-5440
ADIL R ALI M.D.
Internal Medicine (Nephrology)
915 GESSNER RD STE 360, SUITE 360
HOUSTON, TX 77024
Harris County (713) 468-5440
DR. VIJAYAPRAKASH SREENARASIMHAIAH M.D.
Internal Medicine (Nephrology)
915 GESSNER RD STE 360
HOUSTON, TX 77024
Harris County (713) 468-5440
DR. ARIEL M VELASCO M.D.
Internal Medicine (Nephrology)
915 GESSNER RD STE 360
HOUSTON, TX 77024
Harris County (713) 468-5440

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 Colville Williams's NPI number?

The NPI number for Colville Williams is 1861490005. It was assigned to this individual provider in the NPPES registry on July 12, 2005.

Where is Colville Williams located?

Colville Williams practices at 915 Gessner Rd Ste 360, Houston, TX 77024. The listed phone number is (713) 468-5440.

What is Colville Williams's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.

Is Colville Williams enrolled in Medicare?

Yes. Colville Williams 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.

What insurance does Colville Williams accept?

Health plans from Blue Cross and Blue Shield of Texas, Community Health Choice and WellPoint list Colville Williams 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.

Is Colville Williams affiliated with any hospitals?

According to CMS data, Colville Williams is affiliated with Hca Houston Healthcare Kingwood, Houston Methodist Willowbrook Hospital, St Luke's Hospital At The Vintage and Houston Methodist West Hospital.

When was this NPI record last updated?

The NPPES record for Colville Williams was last updated on October 29, 2025. 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.