DR. LESLIE STEWART MASSAD (MD) – Gynecologic Oncology Physician, NPI 1366423360
Gynecologic Oncology Physician
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Doctor Profile
Contacts
Profile Insights
NPPES metrics only — not quality of care.
44 GYNECOLOGICAL ONCOLOGY in MO
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Provider Addresses for DR. LESLIE STEWART MASSAD (MD)
660, South Euclid Avenue, Central West End, City of Saint Louis, Missouri, 63110, United States
MSC 8064-37-1005
SAINT LOUIS, MO 631101010
Phone: (314) 362-3181
Fax: (314) 362-8644
Type: Mailing
Parkview Place, WashU, City of Saint Louis, Missouri, 63110, United States
STE 13C
SAINT LOUIS, MO 631101032
Phone: (314) 362-3181
Fax: (314) 362-8644
Type: Location
PO BOX 7412011
CHICAGO, IL 606742011
Phone: (314) 362-3181
Fax: (314) 362-2893
Type: Mailing
4921 PARKVIEW PL
DIV OBGYN GYNECOLOGIC ONCOLOGY, STE 13C
SAINT LOUIS, MO 631101032
Phone: (314) 362-3181
Fax: (314) 362-2893
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 3 Open Payments records for all available years, with a total value of $2,339.
Total Amount is formed as General ($2,339) + Research ($0) + Ownership ($0) = $2,339.
Last reported payment date: 2024-12-12 • Largest payer in this snapshot: Merck Sharp & Dohme LLC ($2,135).
Total Amount
$2,339
General + Research + Ownership
Payments
3
Total payment records
General Amount
$2,339
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-12
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Merck Sharp & Dohme LLC | $2,135 |
| Myriad Genetic Laboratories, Inc. | $142 |
| Eisai Inc. | $62 |
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: 2007-10-31
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 |
|---|---|---|---|---|
| I20071031000081 | I | Gynecological Oncology | 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 |
|---|---|---|---|---|
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 61 | 31 | $0 |
| 99232 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 51 | 37 | $0 |
| 99231 | Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | 34 | 25 | $0 |
| 99233 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 21 | 19 | $0 |
Insurance plans in this area (ZIP 63110)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Nurse Practitioner | MO | |
| - | MO | |
| - | FL | |
| Occupational Therapist In Private Practice | MO | |
| - | MO | |
| Diagnostic Radiology | IL | |
| - | IL | |
| - | MO | |
| - | MO | |
| - | MO |
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