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

KASSANDRA WILLIAMS PA-C
NPI 1699495770
Physician Assistant in Saint Louis, MO

Q: What is Kassandra Williams's NPI number?

The NPI number for Kassandra Williams is 1699495770. It was assigned to this individual provider in the NPPES registry on August 30, 2022. The provider is also known as Kassandra Heren Pa-C.

Q: What is Kassandra Williams's specialty?

The primary specialty registered for this NPI is Physician Assistant with taxonomy code 363A00000X.

Active since August 30, 2022PECOS EnrolledAccepts Medicare Assignment

10012 KENNERLY RD STE 300, SAINT LOUIS, MO 63128(314) 692-2807(314) 991-0727 Get Directions Write a Review

NPPES record last updated: June 19, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Jul 15, 2024, Nov 20, 2023, Nov 23, 2022 and 1 more (4 updates tracked since 2022).

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About Kassandra Williams Pa-c NPPES

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

KASSANDRA WILLIAMS PA-C (NPI 1699495770) is an individual physician assistant in Saint Louis, Missouri, licensed in Missouri (2022039976) and active in the NPI registry since August 2022. She is enrolled in Medicare PECOS, is affiliated with Mercy Hospital South, and is a graduate of Other (2022).

NPPES Registry Identity

NPI1699495770

Entity TypeIndividualFemale

Primary Taxonomy363A00000X

Provider Legal NameKASSANDRA WILLIAMSCredential: PA-C

Location Address10012 KENNERLY RD STE 300Saint Louis, MO 63128-2197

Mailing Address10012 Kennerly Rd Ste 300Saint Louis, MO 63128-2197 · (314) 692-2807 · Fax (314) 991-0727

Phone(314) 692-2807

Fax(314) 991-0727

Sole ProprietorNo

Medical School CMSOtherGraduated 2022

Enumeration DateAugust 30, 2022

Last NPPES UpdateJune 19, 20264 updates tracked since enumeration

NPPES CertifiedJune 19, 2026

✔ NPI 1699495770 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPhysician AssistantPhysician Assistants & Advanced Practice Nursing Providers

Taxonomy Code363A00000X

License✔ Licensed in MO · 2022039976

Definition

A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.

10012 KENNERLY RD STE 300, Saint Louis, MO 63128

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Other Names 1

Former Name (1)Kassandra Heren Pa-c

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield, Medica, 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

Kassandra Williams Pa-c 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 ID4284002080

PECOS Enrollment IDI20221129002504

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.

148 services113 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

54 services52 patients

Hospital Affiliations CMS Care Compare

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

Mercy Hospital South

Acute Care Hospitals · Saint Louis, MO

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number260077

Location10010 Kennerly RoadSaint Louis, MO 63128 · St. Louis County

Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63128 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

$86.32 typical visit price

range $55.65 – $169.38

Typical copayment $21.58 (range $13.91 – $42.34)

Most-billed visit code 99203

Established Patient

$69.50 typical visit price

range $17.76 – $137.92

Typical copayment $17.37 (range $4.44 – $34.48)

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.

Other Providers at the Same Location NPPES 17

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

MRS. MICHELE RENE YU RN, FNP-C

Nurse Practitioner (Family)