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PATRICIA A. MILLS MD
NPI 1275643553
Emergency Medicine in Fenton, MO

Active since August 30, 2006PECOS EnrolledAccepts Medicare Assignment
1203 SMIZER MILL RD, SUITE 100, FENTON, MO 63026(636) 717-1414(636) 717-1420 Get Directions Write a Review

NPPES record last updated: October 14, 2025. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Patricia A. Mills Md NPPES

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

PATRICIA A. MILLS MD (NPI 1275643553) is an individual emergency medicine provider in Fenton, Missouri, licensed in Missouri (108993) and active in the NPI registry since August 2006. She is enrolled in Medicare PECOS, is affiliated with St Lukes Hospital, and is a graduate of University Of Missouri, Columbia School Of Medicine (1992).

NPPES Registry Identity

NPI1275643553
Entity TypeIndividualFemale
Primary Taxonomy207P00000X
Provider Legal NamePATRICIA A. MILLSCredential: MD
Location Address1203 SMIZER MILL RD, SUITE 100Fenton, MO 63026-3483
Mailing AddressPo Box 18057bSaint Louis, MO 63150-0001 · (314) 364-4200
Phone(636) 717-1414
Fax(636) 717-1420
Sole ProprietorNo
Medical School CMSUniversity Of Missouri, Columbia School Of MedicineGraduated 1992
Enumeration DateAugust 30, 2006
Last NPPES UpdateOctober 14, 2025
NPPES CertifiedOctober 14, 2025
✔ NPI 1275643553 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207P00000X
License✔ Licensed in MO · 108993
Definition
An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.
1203 SMIZER MILL RD, Fenton, MO 63026
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Other Names 1

Former Name (1)Patricia Williams Md

Accepted Insurance

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

Patricia A. Mills 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 ID9335230481
PECOS Enrollment IDI20070803000535
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 4

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.
210 services194 patients
Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more 99212
This is a routine check-up for patients who have previously seen the doctor. During this 10-19 minute visit, the doctor will review your health status, discuss any concerns, and manage ongoing treatments or medications. It's a chance to ensure your health is on track.
36 services36 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.
34 services34 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.
13 services13 patients

Hospital Affiliations CMS Care Compare

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

St Lukes Hospital

Acute Care Hospitals · Chesterfield, MO
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number260179
Location232 S Woods Mill RdChesterfield, MO 63017 · St. Louis County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63026 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
$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 10

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

MERCY HEALTH SERVICES, LLC
Pharmacy (Community/Retail Pharmacy)
1203 SMIZER MILL RD, SUITE 101
FENTON, MO 63026
St. Louis County (636) 717-1491
MISS AMANDA NICOLE BREEDLOVE PNP
Nurse Practitioner (Pediatrics)
1203 SMIZER MILL RD, SUITE 100
FENTON, MO 63026
St. Louis County (636) 717-1414
DEBRA EGGERS FNP-BC
Nurse Practitioner (Family)
1203 SMIZER MILL RD, SUITE 105
FENTON, MO 63026
St. Louis County (636) 717-1350
HEIDI GIOIA RNC,OGNP
Nurse Practitioner (Obstetrics & Gynecology)
1203 SMIZER MILL RD, SUITE 106
FENTON, MO 63026
St. Louis County (636) 717-1390
LAURA MICHELLE COVERT D.O.
Family Medicine
1203 SMIZER MILL RD, STE 105
FENTON, MO 63026
St. Louis County (636) 717-1350
MARY M HAMMEL FNP
Nurse Practitioner (Family)
1203 SMIZER MILL RD, SUITE 105
FENTON, MO 63026
St. Louis County (636) 717-1350
DR. STEPHEN E. THIERAUF MD
Pediatrics
1203 SMIZER MILL RD, STE 108
FENTON, MO 63026
St. Louis County (636) 717-1340
MIRIAM A RUSERT R.PH.
Pharmacist
1203 SMIZER MILL RD, SUITE 101
FENTON, MO 63026
St. Louis County (636) 717-1491

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 Patricia Mills's NPI number?

The NPI number for Patricia Mills is 1275643553. It was assigned to this individual provider in the NPPES registry on August 30, 2006. The provider is also known as Patricia Williams MD.

Where is Patricia Mills located?

Patricia Mills practices at 1203 Smizer Mill Rd Suite 100, Fenton, MO 63026. The listed phone number is (636) 717-1414.

What is Patricia Mills's specialty?

The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.

Is Patricia Mills enrolled in Medicare?

Yes. Patricia Mills 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 Patricia Mills accept?

Health plans from Oscar Insurance Company list Patricia Mills 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 Patricia Mills affiliated with any hospitals?

According to CMS data, Patricia Mills is affiliated with St Lukes Hospital.

When was this NPI record last updated?

The NPPES record for Patricia Mills was last updated on October 14, 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.