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PILAIPUN WILLIAMS M.D.
NPI 1437194784
Internal Medicine in Saint Louis, MO

Active since June 19, 2006PECOS EnrolledAccepts Medicare Assignment
5701 CHIPPEWA ST, SAINT LOUIS, MO 63109(314) 932-5690(314) 932-5692 Get Directions Write a Review

NPPES record last updated: September 16, 2011. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Pilaipun Williams M.d. NPPES

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

PILAIPUN WILLIAMS M.D. (NPI 1437194784) is an individual internal medicine provider in Saint Louis, Missouri, licensed in Missouri (2004023928) and active in the NPI registry since June 2006. She is enrolled in Medicare PECOS and is a graduate of University Of Missouri, Kansas City, School Of Medicine (2001).

NPPES Registry Identity

NPI1437194784
Entity TypeIndividualFemale
Primary Taxonomy207R00000X
Provider Legal NamePILAIPUN WILLIAMSCredential: M.D.
Location Address5701 CHIPPEWA STSaint Louis, MO 63109-1544
Mailing Address11011 Sandistan Manor CtSaint Louis, MO 63146-5588 · (314) 932-5690 · Fax (314) 932-5692
Phone(314) 932-5690
Fax(314) 932-5692
Sole ProprietorNo
Medical School CMSUniversity Of Missouri, Kansas City, School Of MedicineGraduated 2001
Enumeration DateJune 19, 2006
Last NPPES UpdateSeptember 16, 2011
✔ NPI 1437194784 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in MO · 2004023928
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
5701 CHIPPEWA ST, Saint Louis, MO 63109
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Other Names 1

Former Name (1)Pilaipun Saengsamran M.d.

Other Identifiers 3

Medicare ID-Type Unspecified939232717MO
Medicare UPINI50697
Medicaid200778900MO

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arkansas Health & Wellness, Ambetter from Sunflower Health Plan, Ambetter Health and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Pilaipun 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 ID5193732881
PECOS Enrollment IDI20060322000050
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.

Medicare Billing Reassignments

2

Medicare enrollment records show Pilaipun Williams reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Fast Track Medical LLC
Same address
Urgent Care
5701 CHIPPEWA ST
Saint Louis, MO 63109
  • Reassigned Medicare billing, Missouri enrollment
  • 19 clinicians in this Medicare group
NPI 1568770626 (314) 921-7300
Medical Care LLC
15 mi
Health Service
2686 N HIGHWAY 67
Florissant, MO 63033
  • Reassigned Medicare billing, Missouri enrollment
  • 7 clinicians in this Medicare group
NPI 1609481696 (314) 436-9300

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

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 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.
17 services16 patients
New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203
This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.
15 services15 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63109 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
$128.28 typical visit price
range $55.65 – $169.38
Typical copayment $32.07 (range $13.91 – $42.34)
Most-billed visit code 99204
Established Patient
$98.37 typical visit price
range $17.76 – $137.92
Typical copayment $24.59 (range $4.44 – $34.48)
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.

Other Providers at the Same Location NPPES 2

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

LISA LEE ARMBRUSTER M.D.
Family Medicine
5701 CHIPPEWA ST
SAINT LOUIS, MO 63109
St. Louis City (314) 932-5690
FAST TRACK MEDICAL LLC
Clinic/Center (Urgent Care)
5701 CHIPPEWA ST
SAINT LOUIS, MO 63109
St. Louis City (314) 921-7300

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 Pilaipun Williams's NPI number?

The NPI number for Pilaipun Williams is 1437194784. It was assigned to this individual provider in the NPPES registry on June 19, 2006. The provider is also known as Pilaipun Saengsamran M.D..

Where is Pilaipun Williams located?

Pilaipun Williams practices at 5701 Chippewa St, Saint Louis, MO 63109. The listed phone number is (314) 932-5690.

What is Pilaipun Williams's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Pilaipun Williams enrolled in Medicare?

Yes. Pilaipun 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.

Which organizations bill Medicare for Pilaipun Williams's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Pilaipun Williams reassigns Medicare benefits to 2 organizations: Fast Track Medical LLC (Saint Louis, MO) and Medical Care LLC (Florissant, MO). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Pilaipun Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Pilaipun Williams accept?

Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from Arkansas Health & Wellness, Ambetter from Sunflower Health Plan and Ambetter of Oklahoma and 2 other insurers list Pilaipun 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.

When was this NPI record last updated?

The NPPES record for Pilaipun Williams was last updated on September 16, 2011. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.