Doctor profile · Federal record
Dr. Thomas Defer, MD
Internal Medicine Physician (CMS: Internal Medicine) · Saint Louis, MO
- NPI 1023036464
- Accepts Medicare
- MIPS 79.3 / 100 · 2023
- 37 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
4950 Childrens Pl, Dept Internal MED
Saint Louis, MO 631101000
(314) 362-5060
fax (314) 362-6959 - Mailing address
-
Po Box 7412011
Chicago, IL 606742011
Credentials & registration
- NPI registered
- July 2006 — 20 yrs on file
- Profile last updated
- April 17, 2025
- Year of graduation
- 1989 — 37 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State license (1)
- Missouri #R4N34
- Medicaid
- MO #203721238
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1023036464. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
281
Distinct HCPCS
6
Medicare allowed
$24,892
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 83 | 30 | $76 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 64 | 59 | $95 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 60 | 56 | $64 | |
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 47 | 13 | $117 | |
99238 |
Hospital discharge day management, 30 minutes or less | 15 | 15 | $77 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 12 | 12 | $172 |
In context: peer comparison
Among 216 peers in this city , average services per provider: 171. This provider delivers 1.6× the peer median.Hospital affiliations
Frequently asked questions
What is Dr. Thomas Defer's medical specialty?
Dr. Thomas Defer practices Internal Medicine Physician in Saint Louis, MO.
Where does Dr. Thomas Defer practice?
Dr. Thomas Defer practices at 4950 Childrens Pl, Saint Louis, MO 631101000. Office phone: 3143625060.
What is Dr. Thomas Defer's NPI?
Dr. Thomas Defer's National Provider Identifier (NPI) is 1023036464, issued by NPPES.
Does Dr. Thomas Defer accept Medicare assignment?
Yes. Dr. Thomas Defer accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Thomas Defer commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99232); Established patient office or other outpatient visit (HCPCS 99214); Established patient office or other outpatient visit (HCPCS 99213). Source: CMS Medicare Physician & Other Practitioners file.