Mark E. Lassise, M.D.
Psychiatry Physician · Mason City, IA
Mark E. Lassise, M.D. is a psychiatry physician with a practice address in Mason City, Iowa, and NPI 1023002508, issued on Sep 9, 2005. Check the license (Iowa 22919, as entered in NPPES) on the Iowa Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Mark E. Lassise
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- 22919 IA
Self-reported in NPPES; status is on the state search - Practice location
- 250 S Crescent Dr Ste 10, Mason City, IA 50401
- Phone
- (641) 494-5170
- Enumerated
- Sep 9, 2005
- Record last updated
- Jul 6, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (641) 494-5175
- Medicaid ID
- 2223412 IA
- Medicare enrollment
- Enrolled (PECOS I20050513000446); accepts Medicare assignment
- Medical or professional school
- University Of Colorado School Of Medicine, Denver, 1980
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 398 in Iowa → Look up another NPI →
Also registered at 250 S Crescent Dr Ste 10
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Rogerio Ramos, M.D.Psychiatry Physician1295927291
Verify Mark E. Lassise in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIowa Board of Medicine
Search for license 22919Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
29% fewer Medicare Part D claims than the average psychiatry physician in 2024
709 Medicare Part D claims for 101 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 2% of claims.
Most prescribed
- Buspirone Hcl85 claims
- Quetiapine Fumarate66 claims
- Trazodone Hcl58 claims
- Sertraline Hcl51 claims
- Venlafaxine Hcl Er51 claims
- Aripiprazole42 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $954.67
54 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 13,693 providers of this specialty with any payment received $4,954.93 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- North Iowa Mercy ClinicsWest Union, IA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark E. Lassise among 398 psychiatry physician records in Iowa
Mark E. Lassise, M.D. is one of 398 psychiatry physician records with a practice address in Iowa. 66% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 87% newer
- In a Medicare fileYes · 66% of these records are
- In the CMS Doctors and Clinicians fileYes · 47% of these records are
- Graduated1980 · median 2010 among the 188 with a school on file
- Record last updated2020 · 53% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a Iowa practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Psychiatry Physician providers in Iowa
There are 398 psychiatry physician records in Iowa.
All 398 in Iowa → Every provider in Mason City → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Michael Blackmore, M.D.Mason City, IA 504011003896119
- Ronald Larsen, MDMason City, IA 504011306870944
- Rogerio Ramos, M.D.Mason City, IA 504011295927291
- Corey Thompson, M.D.Mason City, IA 504011932526217
- Selena Losee, DOGarner, IA 504381740779552
- Esther Huston, ARNP PMHNP-BCClive, IA 503251225900954
- Margaret MeyerClive, IA 503251649889155
- Naomi Bloom, M.D.Des Moines, IA 503241851464846
Common questions
What is Mark E. Lassise, M.D.'s NPI number?
Mark E. Lassise, M.D.'s National Provider Identifier (NPI) is 1023002508, issued on Sep 9, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Mark E. Lassise, M.D. located?
The NPPES record lists a practice address at 250 S Crescent Dr Ste 10, Mason City, IA, 50401. Phone: (641) 494-5170. Providers update this record themselves, so call before visiting.
How can I verify Mark E. Lassise, M.D.'s license?
NPPES lists Iowa license number 22919, as entered by the provider. Search the Iowa Board of Medicine at https://dial.iowa.gov/about-dial/boards-and-commissions/medicine. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark E. Lassise, M.D. prescribe under Medicare Part D?
In 2024, Mark E. Lassise, M.D. had 709 Medicare Part D claims for 101 beneficiaries; the average among psychiatry physician prescribers was 1,000. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.