JOHN ROSS WILLIAMS M.D.
NPI 1336536200
Neurological Surgery in Houston, TX

Active since April 18, 2015PECOS EnrolledAccepts Medicare Assignment
74.39/100
CMS Quality Rating
6400 FANNIN ST STE 2150, HOUSTON, TX 77030(713) 486-8000 Get Directions Write a Review

NPPES record last updated: June 8, 2023. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About John Ross Williams M.d. NPPES

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

JOHN ROSS WILLIAMS M.D. (NPI 1336536200) is an individual neurological surgery provider in Houston, Texas, licensed in Maryland (D94083) and active in the NPI registry since April 2015. He is enrolled in Medicare PECOS, is affiliated with Memorial Hermann - Texas Medical Center, and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1336536200
Entity TypeIndividualMale
Primary Taxonomy207T00000X
Provider Legal NameJOHN ROSS WILLIAMSCredential: M.D.
Location Address6400 FANNIN ST STE 2150Houston, TX 77030-1524
Mailing Address6400 Fannin St Ste 2070Houston, TX 77030-1541 · (713) 486-7747
Sole ProprietorNo
Medical School CMSOtherGraduated 2015
Enumeration DateApril 18, 2015
Last NPPES UpdateJune 8, 2023
NPPES CertifiedJune 8, 2023
NPI 1336536200 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

Primary SpecialtyNeurological SurgeryAllopathic & Osteopathic Physicians
Taxonomy Code207T00000X
License Licensed in MD · D94083
Definition
A neurological surgeon provides the operative and non-operative management (i.e., prevention, diagnosis, evaluation, treatment, critical care, and rehabilitation) of disorders of the central, peripheral, and autonomic nervous systems, including their supporting structures and vascular supply; the evaluation and treatment of pathological processes which modify function or activity of the nervous system; and the operative and non-operative management of pain. A neurological surgeon treats patients with disorders of the nervous system; disorders of the brain, meninges, skull, and their blood supply, including the extracranial carotid and vertebral arteries; disorders of the pituitary gland; disorders of the spinal cord, meninges, and vertebral column, including those which may require treatment by spinal fusion or instrumentation; and disorders of the cranial and spinal nerves throughout their distribution.
6400 FANNIN ST STE 2150, Houston, TX 77030

Secondary Practice Locations 2

Location 1325 9th Ave Dept Of, Box 359924Seattle, WA 98104-2420 · Phone (206) 744-9389 · Fax (206) 744-9942
Location 2600 N WOLFE STREET, meyer 7-113BALTIMORE, MD 21287-2128 · Phone (410) 955-4424 · Fax (410) 502-3399

Accepted 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

John Ross Williams M.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 ID5799087730
PECOS Enrollment IDI20230706002132
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 2

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.
32 services29 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.
28 services19 patients

Hospital Affiliations CMS Care Compare 5

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

Memorial Hermann - Texas Medical Center

Acute Care Hospitals · Houston, TX
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number450068
Location6411 FanninHouston, TX 77030 · Harris County
Emergency services Birthing friendly

Memorial Hermann Hospital System

Acute Care Hospitals · Houston, TX
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number450184
Location1635 North Loop WestHouston, TX 77008 · Harris County
Emergency services Birthing friendly

Memorial Hermann Memorial City Hospital

Acute Care Hospitals · Houston, TX
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number450610
Location921 GessnerHouston, TX 77024 · Harris County
Emergency services Birthing friendly

Memorial Hermann Katy Hospital

Acute Care Hospitals · Katy, TX
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number450847
Location23900 Katy FreewayKaty, TX 77494 · Fort Bend County
Emergency services Birthing friendly

Memorial Hermann Sugar Land Hospital

Acute Care Hospitals · Sugar Land, TX
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number450848
Location17500 W Grand Parkway SouthSugar Land, TX 77479 · Fort Bend County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 77030 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
$72.62 typical visit price
range $18.60 – $143.93
Typical copayment $18.15 (range $4.65 – $35.98)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

74.39/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality64.71
Promoting Interoperability97
Improvement Activities40
Cost52.43

Other Providers at the Same Location NPPES 5

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

Neurological Surgery
6400 FANNIN ST STE 2150
HOUSTON, TX 77030
Neurological Surgery
6400 FANNIN ST STE 2150
HOUSTON, TX 77030
Nurse Practitioner (Acute Care)
6400 FANNIN ST STE 2150
HOUSTON, TX 77030
Anesthesiology (Pain Medicine)
6400 FANNIN ST STE 2150
HOUSTON, TX 77030
Nurse Practitioner (Acute Care)
6400 FANNIN ST STE 2150
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 John Williams's NPI number?

The NPI number for John Williams is 1336536200. It was assigned to this individual provider in the NPPES registry on April 18, 2015.

Where is John Williams located?

John Williams practices at 6400 Fannin St Ste 2150, Houston, TX 77030. The listed phone number is (713) 486-8000.

What is John Williams's specialty?

The primary specialty registered for this NPI is Neurological Surgery with taxonomy code 207T00000X.

Is John Williams enrolled in Medicare?

Yes. John 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 John Williams accept?

Health plans from Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter from Superior HealthPlan and Ambetter of Oklahoma and 4 other insurers list John 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 John Williams affiliated with any hospitals?

According to CMS data, John Williams is affiliated with Memorial Hermann - Texas Medical Center, Memorial Hermann Hospital System, Memorial Hermann Memorial City Hospital, Memorial Hermann Katy Hospital and Memorial Hermann Sugar Land Hospital.

When was this NPI record last updated?

The NPPES record for John Williams was last updated on June 8, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.