Millicent Leigh Horn, MD
General Practice Physician · Saint Louis, MO
Millicent Leigh Horn, MD is a general practice physician with a practice address in Saint Louis, Missouri, and NPI 1427673821, issued on Jun 11, 2020. Check the license (Missouri 2022032316, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Millicent Leigh Horn
- Credential
- MD
- Primary taxonomy
- General Practice Physician 208D00000X
- License number
- 2022032316 MO
Self-reported in NPPES; status is on the state search - Practice location
- 4901 Forest Park Ave, Saint Louis, MO 63108
- Phone
- (314) 362-5060
- Enumerated
- Jun 11, 2020
- Record last updated
- Sep 24, 2025
- Fax
- (314) 362-6959
- Medicaid ID
- 200084960 MO
- Entity
- Type 1 · individual
8 nearest general practice physician records → All 191 in Missouri → Look up another NPI →
Also registered at 4901 Forest Park Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Ashley Altman, FNPNurse Practitioner1457882417
- Kelly Amerson, WHNPWomen's Health Nurse Practitioner1205993169
- Milan Anadkat, MDDermatology Physician1639267149
Verify Millicent Leigh Horn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
Search for license 2022032316Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average general practice physician in 2024
97 Medicare Part D claims for 32 beneficiaries, against an average of 3,030 among the 8,395 providers of this specialty who prescribed in Part D. Brand-name drugs were 18% of claims.
Most prescribed
- Atorvastatin Calcium15 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 79.3 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Millicent Leigh Horn among 191 general practice physician records in Missouri
Millicent Leigh Horn, MD is one of 191 general practice physician records with a practice address in Missouri. 60% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 86% of them.
- NPI issued2020 · 86% of these records are older, 8% newer
- In a Medicare fileYes · 60% of these records are
- In the CMS Doctors and Clinicians fileNo · 32% of these records are
- Record last updated2025 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208D00000X and a Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
General Practice Physician providers in Missouri
There are 191 general practice physician records in Missouri.
All 191 in Missouri → Every provider in Saint Louis → General Practice Physician nationwide →
The 8 general practice physician records with the nearest ZIP codes
- Eva Aagaard, MDSaint Louis, MO 631081144286097
- Thomas Ciesielski, MDSaint Louis, MO 631081932420338
- Laura Colletti, MDSaint Louis, MO 631081083647119
- John Cooper, MD, PHDSaint Louis, MO 631081518398916
- Dominique Cosco, MDSaint Louis, MO 631081851576656
- Maxwell FohtungSaint Louis, MO 631081982088571
- Nickole Forget, MDSaint Louis, MO 631081437126927
- Catherine Hermann, MDSaint Louis, MO 631081437268596
Common questions
What is Millicent Leigh Horn, MD's NPI number?
Millicent Leigh Horn, MD's National Provider Identifier (NPI) is 1427673821, issued on Jun 11, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Millicent Leigh Horn, MD located?
The NPPES record lists a practice address at 4901 Forest Park Ave, Saint Louis, MO, 63108. Phone: (314) 362-5060. Providers update this record themselves, so call before visiting.
How can I verify Millicent Leigh Horn, MD's license?
NPPES lists Missouri license number 2022032316, as entered by the provider. Search the Missouri Board of Registration for the Healing Arts at https://www.fsmb.org/contact-a-state-medical-board/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Millicent Leigh Horn, MD prescribe under Medicare Part D?
In 2024, Millicent Leigh Horn, MD had 97 Medicare Part D claims for 32 beneficiaries; the average among general practice physician prescribers was 3,030. Part D covers Medicare prescriptions only.
What is Millicent Leigh Horn, MD's MIPS final score?
The 2023 MIPS final score is 79.3 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.