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

STACY JEFFERSON BAKER M.D.
NPI 1720492028
Family Medicine in Saint Charles, MO

Q: What is Stacy Baker's NPI number?

The NPI number for Stacy Baker is 1720492028. It was assigned to this individual provider in the NPPES registry on June 13, 2014. The provider is also known as Stacy Antoinette Jefferson M.D..

Q: What is Stacy Baker's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

Q: When was this NPI record last updated?

The NPPES record for Stacy Baker was last updated on October 2, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 40 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.

Active since June 13, 2014PECOS EnrolledAccepts Medicare Assignment

1551 WALL ST STE 400, SAINT CHARLES, MO 63303(636) 669-7006(636) 669-7008 Get Directions Write a Review

NPPES record last updated: October 2, 2026. Verified against the NPPES registry weekly; last sync: November 08, 2026.

Record update history: Oct 2, 2026, Jul 16, 2026, Jul 30, 2024 and 2 more (5 updates tracked since 2016).

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About Stacy Jefferson Baker M.d. NPPES

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

STACY JEFFERSON BAKER M.D. (NPI 1720492028) is an individual family medicine provider in Saint Charles, Missouri, licensed in Missouri (2017018156) and active in the NPI registry since June 2014. She is enrolled in Medicare PECOS, is affiliated with Ssm St Joseph Health Center, and is a graduate of Southern Illinois University School Of Medicine (2013).

NPPES Registry Identity

NPI1720492028

Entity TypeIndividualFemale

Primary Taxonomy207Q00000X

Provider Legal NameSTACY JEFFERSON BAKERCredential: M.D.

Location Address1551 WALL ST STE 400Saint Charles, MO 63303-3541

Mailing AddressPo Box 419052Saint Louis, MO 63141-9052 · (314) 851-1000

Phone(636) 669-7006

Fax(636) 669-7008

Sole ProprietorNo

Medical School CMSSouthern Illinois University School Of MedicineGraduated 2013

Enumeration DateJune 13, 2014

Last NPPES UpdateOctober 2, 20265 updates tracked since enumeration

NPPES CertifiedOctober 2, 2026

✔ NPI 1720492028 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyFamily MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207Q00000X

License✔ Licensed in MO · 2017018156

Definition

Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity.

1551 WALL ST STE 400, Saint Charles, MO 63303

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Other Names 1

Former Name (1)Stacy Antoinette Jefferson M.d.

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

Stacy Jefferson Baker 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 ID4082917497

PECOS Enrollment IDI20170822002211

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 Reassignment

Medicare enrollment records show Stacy Baker reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

American Multispecialty Group Inc.

9.5 mi

Internal Medicine

555 MARYVILLE UNIVERSITY DR STE 240
Saint Louis, MO 63141

Reassigned Medicare billing, Missouri enrollment
119 clinicians in this Medicare group

NPI 1972559532 (314) 851-1000

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 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 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.

73 services56 patients

Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit G0439

An annual wellness visit is a yearly appointment with your primary care provider to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's a subsequent visit, meaning it follows an initial assessment.

33 services33 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.

30 services22 patients

Insertion of needle into vein for collection of blood sample 36415

This procedure involves inserting a small needle into a vein, typically in your arm, to collect a blood sample. It's a quick and simple process to help diagnose or monitor health conditions. You may feel a small prick, but discomfort is minimal.

15 services14 patients

Hospital Affiliations CMS Care Compare 3

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

Ssm St Joseph Health Center

Acute Care Hospitals · Saint Charles, MO

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number260005

Location300 1st Capitol DrSaint Charles, MO 63301 · St. Charles County

Emergency services

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

Ssm St Joseph Hospital West

Acute Care Hospitals · Lake Saint Louis, MO

3/5 CMS rating

OwnershipVoluntary non-profit - Church

CMS Certification Number260200

Location100 Medical PlazaLake Saint Louis, MO 63367 · St. Charles County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63303 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.

Referred Medical Equipment & Supplies CMS DME claims 3

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253

DME-Other DME · category DE017N

9 suppliers23 claims67 services$5.03 avg. paid by Medicare

Enteral feeding supply kit; pump fed, per day, includes but not limited to feeding/flushing syringe, administration set tubing, dressings, tape B4035

Other-Enteral and Parenteral · category OB006N

1 supplier12 claims360 services$4.97 avg. paid by Medicare

Enteral formula, nutritionally complete, for special metabolic needs, excludes inherited disease of metabolism, includes altered composition of proteins, fats, carbohydrates, vitamins and/or minerals, may include fiber, administered through an enteral feeding tube, 100 calories = 1 unit B4154

Other-Enteral and Parenteral · category OB006N

1 supplier12 claims4,661 services$0.60 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 2

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

ELIZABETH H MAYLACK D.O.

Family Medicine

1551 WALL ST STE 400
SAINT CHARLES, MO 63303

St. Charles County (636) 669-7006

AMY THERESA MCCORY ANP

Nurse Practitioner (Adult Health)

1551 WALL ST STE 400
SAINT CHARLES, MO 63303

St. Charles County (636) 669-7006

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 Stacy Baker's NPI number?

The NPI number for Stacy Baker is 1720492028. It was assigned to this individual provider in the NPPES registry on June 13, 2014. The provider is also known as Stacy Antoinette Jefferson M.D..

Where is Stacy Baker located?

Stacy Baker practices at 1551 Wall St Ste 400, Saint Charles, MO 63303. The listed phone number is (636) 669-7006.

What is Stacy Baker's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

Is Stacy Baker enrolled in Medicare?

Yes. Stacy Baker 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 organization bills Medicare for Stacy Baker's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Stacy Baker reassigns Medicare benefits to American Multispecialty Group Inc. (Saint Louis, MO). The 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 Stacy Baker's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Stacy Baker accept?

Health plans from Ambetter Health, Ambetter from Arkansas Health & Wellness, Ambetter from Sunflower Health Plan, Ambetter of Oklahoma and Ambetter of Tennessee and 3 other insurers list Stacy Baker 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 Stacy Baker affiliated with any hospitals?

According to CMS data, Stacy Baker is affiliated with Ssm St Joseph Health Center, Mercy Hospital St Louis and Ssm St Joseph Hospital West.

When was this NPI record last updated?

The NPPES record for Stacy Baker was last updated on October 2, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 40 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.