Physician Profile
Unclaimed ProfileAbout LASSISE
Mark E Lassise, M.D. is a healthcare provider in Mason City, IA specialising in psychiatry. Mark trained at University of Colorado School of Medicine, Denver, graduating in 1980. According to Medicare claims data, Mark cared for 202 Medicare patients across 522 services.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Common questions
What is Dr. Lassise's specialty?
Dr. Lassise is a psychiatry in Mason City, IA. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “PSYCHIATRY”.
NPI registry
Where can I find Dr. Lassise?
Dr. Lassise is listed at 250 S CRESCENT DR STE 10, Mason City, IA 50401. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Dr. Lassise?
The number on file is (641) 494-5170. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Lassise's NPI number?
Dr. Lassise's National Provider Identifier is 1023002508. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
What is Dr. Lassise's medical education?
Dr. Lassise attended University of Colorado School of Medicine, Denver, graduating in 1980. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Lassise been practising?
Dr. Lassise has 46 years experience. Calculated from a graduation year of 1980, reported in the CMS National Downloadable File.
CMS public data
What is Dr. Lassise known for?
According to Medicare billing data, Dr. Lassise provides treatments such as psychiatric diagnostic evaluation with medical services, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Lassise confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Lassise. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (641) 494-5170
- Email not available
Practice Locations
250 S CRESCENT DR STE 10
Mason City, IA 50401
Procedures Most Often Billed to Medicare
522 services · 202 patients · 5 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Psychiatric diagnostic evaluation with medical services | Treatment | 90792 |
12 |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
403 |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
52 |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
42 |
| New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more | Office visit | 99203 |
13 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
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Claim this profileRelated providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other psychiatry specialists at this location 1
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 1
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 28 related providers in 4 groups
Other psychiatry specialists in Mason City 4
Same specialty, same city.
Trained at University of Colorado School of Medicine, Denver 8
Other providers in the same specialty who trained at the same institution.
Class of 1980 at University of Colorado School of Medicine, Denver 8
Providers who graduated from the same medical school in the same year.
Also performs Psychiatric diagnostic evaluation with medical services 8
Providers in IA who bill this service to Medicare most often.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.