DR. MARK E LASSISE (M.D.) – Psychiatry Physician, NPI 1023002508
Psychiatry Physician
Main info
Doctor Profile
Contacts
Profile Insights
NPPES metrics only — not quality of care.
304 PSYCHIATRY in IA
Provider Addresses for DR. MARK E LASSISE (M.D.)
250, South Crescent Drive, Mason City, Cerro Gordo County, Iowa, 50401, United States
MASON CITY, IA 504012926
Phone: (641) 494-5400
Fax: (641) 494-5403
Type: Mailing
250 S CRESCENT DR STE 10
MASON CITY, IA 504012926
Phone: (641) 494-5170
Fax: (641) 494-5175
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 114 Open Payments records for all available years, with a total value of $1,884.
Total Amount is formed as General ($1,884) + Research ($0) + Ownership ($0) = $1,884.
Last reported payment date: 2024-12-18 • Largest payer in this snapshot: ABBVIE INC. ($474).
Total Amount
$1,884
General + Research + Ownership
Payments
114
Total payment records
General Amount
$1,884
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-18
Latest reported date
Top Companies
Largest payers in this snapshot
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: 2005-05-13
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 |
|---|---|---|---|---|
| I20050513000446 | I | Psychiatry | IA | 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 | 422 | 184 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 176 | 127 | $0 |
| 90792 | Psychiatric diagnostic evaluation with medical services | 25 | 25 | $0 |
Insurance plans in this area (ZIP 50401)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| PSYCHIATRY | IA | 90792 | Psychiatric diagnostic evaluation with medical services | 65 | 65 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Physician Assistant | TN | |
| - | IA | |
| - | PA | |
| Cardiovascular Disease (Cardiology), Critical Care (Intensivists) | IA | |
| Certified Registered Nurse Anesthetist (Crna) | IA | |
| Physician Assistant | IA | |
| - | IA | |
| Sleep Medicine | IA | |
| Nurse Practitioner | IA | |
| Nurse Practitioner | IA |
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