DR. JOHN SPENCER MAYS (MD) – Internal Medicine Physician, NPI 1083108062
Internal Medicine Physician
Main info
Doctor Profile
Contacts
Profile Insights
NPPES metrics only — not quality of care.
4,190 INTERNAL MEDICINE in MO
Provider Addresses for DR. JOHN SPENCER MAYS (MD)
969 N MASON RD STE 110
SAINT LOUIS, MO 631416338
Phone: (314) 996-3434
Type: Mailing
1 BARNES JEWISH HOSPITAL PLZ
SAINT LOUIS, MO 631101003
Phone: (314) 362-5000
Type: Location
660, South Euclid Avenue, Central West End, City of Saint Louis, Missouri, 63110, United States
SAINT LOUIS, MO 631101010
Phone: (314) 362-5000
Type: Mailing
1 Barnes Jewish Hospital Plz
Saint Louis, MO 631101003
Phone: (314) 362-5000
Type: Location
969 N MASON RD STE 160
SAINT LOUIS, MO 631416387
Phone: (314) 996-3434
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 180 Open Payments records for all available years, with a total value of $3,116.
Total Amount is formed as General ($3,116) + Research ($0) + Ownership ($0) = $3,116.
Last reported payment date: 2024-12-19 • Largest payer in this snapshot: ABBVIE INC. ($589).
Total Amount
$3,116
General + Research + Ownership
Payments
180
Total payment records
General Amount
$3,116
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-19
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| ABBVIE INC. | $589 |
| GlaxoSmithKline, LLC. | $395 |
| PFIZER INC. | $394 |
| Novo Nordisk Inc | $268 |
| Novartis Pharmaceuticals Corporation | $101 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2021-07-14
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20210714000243 | I | Internal Medicine | MO | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 337 | 230 | $0 |
| G0439 | Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 313 | 313 | $0 |
| 36415 | Insertion of needle into vein for collection of blood sample | 226 | 187 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 118 | 96 | $0 |
| G0008 | Administration of influenza virus vaccine | 88 | 87 | $0 |
Insurance plans in this area (ZIP 63141)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Nurse Practitioner | MO | |
| - | MO | |
| - | MO | |
| Family Practice | MO | |
| Nurse Practitioner | MO | |
| Hospitalist, Family Practice | MO | |
| Nurse Practitioner | MO | |
| - | MO | |
| Family Practice | MO | |
| Internal Medicine, Hospitalist | MO |
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