Doctor profile · Federal record

Dr. Ryan Day, MD PHD

Medical Oncology Physician (CMS: Medical Oncology) · Internal Medicine Physician · Saint Louis, MO

  • NPI 1417307976
  • Accepts Medicare
  • MIPS 79.3 / 100 · 2023
  • 10 yrs in practice
  • Male
  • Group practice
  • No sanctions

Practice & contact

NPPES Updated May 11, 2026
Primary practice
4921 Parkview Pl, Div Im Medical Oncology, Ste 7A, 7B, 7C
Saint Louis, MO 631101032
(800) 647-2098
fax (314) 362-3192
Mailing address
Po Box 7412011
Chicago, IL 606742011

Credentials & registration

NPPES · NUCC
NPI registered
June 2016 — 10 yrs on file
Profile last updated
April 17, 2025
Year of graduation
2016 — 10 yrs since
Specialty taxonomy
207RX0202X — NUCC code
State license (1)
Missouri #2019032162
Medicaid
MO #200063707

Federal sanctions & exclusions

OIG LEIE Updated May 11, 2026

No sanctions, exclusions or revocations on file

Checked against OIG LEIE on NPI 1417307976. Last verified May 11, 2026.

Medicare procedures · 2023

Top services delivered

CMS Provider Utilization
Total services
389
Distinct HCPCS
2
Medicare allowed
$34,049
HCPCS Description Services Patients Avg allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 284 41 $77
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 105 26 $116

In context: peer comparison

Among 44 peers in this city , average services per provider: 919. This provider delivers 0.4× the peer median.

Hospital affiliations

CMS Hospital Compare

Frequently asked questions

Auto-generated from federal data
What is Dr. Ryan Day's medical specialty?
Dr. Ryan Day practices Medical Oncology Physician in Saint Louis, MO.
Where does Dr. Ryan Day practice?
Dr. Ryan Day practices at 4921 Parkview Pl, Saint Louis, MO 631101032. Office phone: 8006472098.
What is Dr. Ryan Day's NPI?
Dr. Ryan Day's National Provider Identifier (NPI) is 1417307976, issued by NPPES.
Does Dr. Ryan Day accept Medicare assignment?
Yes. Dr. Ryan Day accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Ryan Day commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99232); Subsequent hospital care with moderate levelof medical decision making (HCPCS 99233). Source: CMS Medicare Physician & Other Practitioners file.