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DR. TIMOTHY JOHN WILLIAMS MD
NPI 1699036731
Internal Medicine in Saint Louis, MO

Active since June 05, 2012PECOS EnrolledAccepts Medicare Assignment
615 S NEW BALLAS RD, SAINT LOUIS, MO 63141(314) 251-6339(314) 251-4564 Get Directions Write a Review

NPPES record last updated: November 3, 2025. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Nov 3, 2025, Jun 14, 2021 (2 updates tracked since 2021).

About Dr. Timothy John Williams Md NPPES

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

DR. TIMOTHY JOHN WILLIAMS MD (NPI 1699036731) is an individual internal medicine provider in Saint Louis, Missouri, licensed in Missouri (2016020999) and active in the NPI registry since June 2012. He is enrolled in Medicare PECOS, is affiliated with Mercy Hospital St Louis, and is a graduate of University Of Cincinnati College Of Medicine (2012).

NPPES Registry Identity

NPI1699036731
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. TIMOTHY JOHN WILLIAMSCredential: MD
Location Address615 S NEW BALLAS RDSaint Louis, MO 63141-8221
Mailing Address615 S New Ballas RdSaint Louis, MO 63141-8221 · (314) 251-6339 · Fax (314) 251-4564
Phone(314) 251-6339
Fax(314) 251-4564
Sole ProprietorNo
Medical School CMSUniversity Of Cincinnati College Of MedicineGraduated 2012
Enumeration DateJune 5, 2012
Last NPPES UpdateNovember 3, 20252 updates tracked since enumeration
NPPES CertifiedNovember 3, 2025
✔ NPI 1699036731 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in MO · 2016020999
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.
Also ListedHospitalistTaxonomy 208M00000X · License 2016020999 (MO)
615 S NEW BALLAS RD, Saint Louis, MO 63141
Open in Google Maps ↗

Other Identifiers 1

MedicaidENROLLEDIL

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. Timothy John Williams Md 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 ID446487953
PECOS Enrollment IDI20160722001648
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 5

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.
414 services191 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
244 services120 patients
Hospital discharge day management, more than 30 minutes 99239
Hospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.
213 services207 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.
57 services57 patients
Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes 99231
Follow-up hospital inpatient care is a daily service where a healthcare professional checks on your health progress during your hospital stay. Each session typically lasts 15 minutes, involving updates on your condition and adjustments to your treatment plan, if necessary.
38 services29 patients

Hospital Affiliations CMS Care Compare 4

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

Mercy Hospital St Louis

Acute Care Hospitals · Saint Louis, MO
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number260020
Location615 New Ballas RoadSaint Louis, MO 63141 · St. Louis County
Emergency services Birthing friendly

Mercy Hospital Washington

Acute Care Hospitals · Washington, MO
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number260052
Location901 East 5th StreetWashington, MO 63090 · Franklin County
Emergency services

Missouri Baptist Medical Center

Acute Care Hospitals · Town And Country, MO
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number260108
Location3015 N Ballas RdTown And Country, MO 63131 · St. Louis County
Emergency services Birthing friendly

Mercy Hospital Lincoln

Critical Access Hospitals · Troy, MO
OwnershipGovernment - Local
CMS Certification Number261319
Location1000 East Cherry StreetTroy, MO 63379 · Lincoln County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63141 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 20

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

MRS. PATRICIA ANN RICE APN
Nurse Practitioner (Family)
615 S NEW BALLAS RD
SAINT LOUIS, MO 63141
St. Louis County (314) 251-6339
MARY BETH WALKER FNP
Nurse Practitioner (Family)
615 S NEW BALLAS RD
SAINT LOUIS, MO 63141
St. Louis County (314) 251-6000
LOVEPREET SINGH RANDHAWA MD
Internal Medicine
615 S NEW BALLAS RD
SAINT LOUIS, MO 63141
St. Louis County (314) 251-6339
DR. CONNOR ROBERT REIS DO
Internal Medicine
615 S NEW BALLAS RD
SAINT LOUIS, MO 63141
St. Louis County (314) 251-6930
MR. SHEBY THOMAS AA-S
Anesthesiologist Assistant
615 S NEW BALLAS RD, DEPT OF ANESTHESIOLOGY
SAINT LOUIS, MO 63141
St. Louis County (636) 386-9224
JOSE L OLIVER SEGARRA
Dentist
615 S NEW BALLAS RD
SAINT LOUIS, MO 63141
St. Louis County (314) 251-6382
CAREN BIRKENKAMP PMHNP-BC
Nurse Practitioner (Psychiatric/Mental Health)
615 S NEW BALLAS RD
SAINT LOUIS, MO 63141
St. Louis County (314) 251-6000
ANAS M HASIC MD
Internal Medicine
615 S NEW BALLAS RD
SAINT LOUIS, MO 63141
St. Louis County (314) 509-5305

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 Timothy Williams's NPI number?

The NPI number for Timothy Williams is 1699036731. It was assigned to this individual provider in the NPPES registry on June 5, 2012.

Where is Timothy Williams located?

Timothy Williams practices at 615 S New Ballas Rd, Saint Louis, MO 63141. The listed phone number is (314) 251-6339.

What is Timothy Williams's specialty?

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

Is Timothy Williams enrolled in Medicare?

Yes. Timothy 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.

Is Timothy Williams affiliated with any hospitals?

According to CMS data, Timothy Williams is affiliated with Mercy Hospital St Louis, Mercy Hospital Washington, Missouri Baptist Medical Center and Mercy Hospital Lincoln.

When was this NPI record last updated?

The NPPES record for Timothy Williams was last updated on November 3, 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.