Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

SHELLY CHRISTINA WILLIAMS-ISINGO FNP-BC, PMHNP-BC
NPI 1538680822
Nurse Practitioner - Psychiatric/Mental Health in Katy, TX

Q: What is Shelly Williams-isingo's NPI number?

The NPI number for Shelly Williams-isingo is 1538680822. It was assigned to this individual provider in the NPPES registry on June 27, 2017.

Q: What is Shelly Williams-isingo's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Psychiatric/Mental Health, with taxonomy code 363LP0808X.

Active since June 27, 2017PECOS EnrolledAccepts Medicare Assignment

440 COBIA DR STE 602, KATY, TX 77494(713) 987-7828 Get Directions Write a Review

NPPES record last updated: September 8, 2026. Verified against the NPPES registry weekly; last sync: September 13, 2026.

Record update history: Sep 8, 2026, Jul 10, 2024, Aug 8, 2019 and 1 more (4 updates tracked since 2017).

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About Shelly Christina Williams-isingo Fnp-bc, Pmhnp-bc NPPES

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

SHELLY CHRISTINA WILLIAMS-ISINGO FNP-BC, PMHNP-BC (NPI 1538680822) is an individual psychiatric/mental health provider in Katy, Texas, licensed in Texas (AP138281) and active in the NPI registry since June 2017. She is enrolled in Medicare PECOS and is a graduate of Other (2017).

NPPES Registry Identity

NPI1538680822

Entity TypeIndividualFemale

Primary Taxonomy363LP0808X

Provider Legal NameSHELLY CHRISTINA WILLIAMS-ISINGOCredential: FNP-BC, PMHNP-BC

Location Address440 COBIA DR STE 602Katy, TX 77494-6892

Mailing Address440 Cobia Dr Ste 602Katy, TX 77494-6892 · (713) 987-7828 · Fax (713) 804-9449

Phone(713) 987-7828

Sole ProprietorNo

Medical School CMSOtherGraduated 2017

Enumeration DateJune 27, 2017

Last NPPES UpdateSeptember 8, 20264 updates tracked since enumeration

NPPES CertifiedSeptember 8, 2026

✔ NPI 1538680822 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNurse Practitioner · Psychiatric/Mental HealthPhysician Assistants & Advanced Practice Nursing Providers

Taxonomy Code363LP0808X

License✔ Licensed in TX · AP138281

440 COBIA DR STE 602, Katy, TX 77494

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Other Identifiers 3

OtherAP61561016WA · Washington State License

OtherAP09322LA · Louisiana State Board Of Nursing

OtherAP138281TX · Texas License

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Insurance Company, UnitedHealthcare.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

Shelly Christina Williams-isingo Fnp-bc, Pmhnp-bc 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 ID4082988167

PECOS Enrollment IDI20240723004780

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.

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.

30 services26 patients

Detection test by immunoassay with direct visual observation for severe acute respiratory syndrome coronavirus 2 (covid-19) 87811

This is a test to detect COVID-19, the virus causing severe respiratory illness. It uses a method called immunoassay, which identifies the virus by its unique proteins. The test is directly observed for accuracy. It helps determine if you're currently infected.

11 services11 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 77494 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

$84.92 typical visit price

range $54.84 – $166.88

Typical copayment $21.23 (range $13.71 – $41.72)

Most-billed visit code 99203

Established Patient

$97.05 typical visit price

range $17.52 – $136.11

Typical copayment $24.26 (range $4.38 – $34.02)

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.

Supply allowance for therapeutic continuous glucose monitor (cgm), includes all supplies and accessories, 1 month supply = 1 unit of service K0553

DME-Other DME · category DE017N

1 supplier11 claims11 services$180.37 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

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

JULIA BENAVIDES NP

Nurse Practitioner (Psychiatric/Mental Health)

440 COBIA DR STE 602
KATY, TX 77494

Fort Bend County (713) 987-7828

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 Shelly Williams-isingo's NPI number?

The NPI number for Shelly Williams-isingo is 1538680822. It was assigned to this individual provider in the NPPES registry on June 27, 2017.

Where is Shelly Williams-isingo located?

Shelly Williams-isingo practices at 440 Cobia Dr Ste 602, Katy, TX 77494. The listed phone number is (713) 987-7828.

What is Shelly Williams-isingo's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Psychiatric/Mental Health, with taxonomy code 363LP0808X.

Is Shelly Williams-isingo enrolled in Medicare?

Yes. Shelly Williams-isingo 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 Shelly Williams-isingo accept?

Health plans from Oscar Insurance Company and UnitedHealthcare list Shelly Williams-isingo 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.

When was this NPI record last updated?

The NPPES record for Shelly Williams-isingo was last updated on September 8, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 days 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.