Doctor profile · Federal record
Dr. Spencer Mares, FNP-C, AGACNP-BC
Acute Care Nurse Practitioner (CMS: Nurse Practitioner) · Family Nurse Practitioner · Family Nurse Practitioner · Lake Saint Louis, MO
- NPI 1437667490
- Accepts Medicare
- 9 yrs in practice
- Licensed in 2 states
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
100 Medical Plz
Lake Saint Louis, MO 633671366
(636) 625-5200 - Mailing address
-
50 Meadow Run CT
Saint Peters, MO 633035805
Credentials & registration
- NPI registered
- January 2018 — 8 yrs on file
- Profile last updated
- March 10, 2023
- Year of graduation
- 2017 — 9 yrs since
- Specialty taxonomy
- 363LA2100X — NUCC code
- State licenses (3)
- Missouri #2023006109 · Missouri #2018001739 · Illinois #277.000663
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1437667490. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
32
Distinct HCPCS
1
Medicare allowed
$4,594
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 32 | 32 | $144 |
In context: peer comparison
Among 1 peers in this city , average services per provider: 32. This provider delivers 1.0× the peer median.Open Payments
Industry payments received
All-time total
$20
Transactions
1
Manufacturers
1
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| ZOLL Services LLC (A/K/A ZOLL LifeCor Corp) | 1 | $20.11 |
By nature of payment
Frequently asked questions
What is Dr. Spencer Mares's medical specialty?
Dr. Spencer Mares practices Acute Care Nurse Practitioner in Lake Saint Louis, MO.
Where does Dr. Spencer Mares practice?
Dr. Spencer Mares practices at 100 Medical Plz, Lake Saint Louis, MO 633671366. Office phone: 6366255200.
What is Dr. Spencer Mares's NPI?
Dr. Spencer Mares's National Provider Identifier (NPI) is 1437667490, issued by NPPES.
Does Dr. Spencer Mares accept Medicare assignment?
Yes. Dr. Spencer Mares accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Spencer Mares commonly perform?
Top Medicare-reported procedures in 2023: Initial hospital care with moderate level of medical decision making (HCPCS 99223). Source: CMS Medicare Physician & Other Practitioners file.