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Edit this profileWhere to find Mark Yassa, D.O.
- Massapequa location main office
4150 Sunrise Hwy, Massapequa, NY 11758 - West Islip location
1000 Montauk Hwy, West Islip, NY 11795
About Dr. Yassa
Based in Massapequa, NY, Mark Yassa, D.O. is listed in the NPI registry under obstetrics. According to Medicare claims data, the services billed most often include new patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more. NPI 1922488618 identifies this record in the national registry.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (516) 393-1000
- Email not available
Practice Locations
4150 SUNRISE HWY
Massapequa, NY 11758
1000 Montauk Hwy
West Islip, NY 11795
Procedures Most Often Billed to Medicare
14 services · 14 patients · 1 distinct code
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more | Office visit | 99204 |
14 | As often as other peers in Obstetrics |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
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.
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
More connections — 8 related providers in 1 group
Class of 2015 at Other 8
Providers who graduated from the same medical school in the same year.
Common questions
What does Mark Yassa specialize in?
Mark Yassa is an obstetrics in Massapequa, NY. That is the designation recorded for this NPI in the federal registry.
NPI registry
Where is Mark Yassa located?
Mark Yassa is listed at 4150 Sunrise Hwy, Massapequa, NY 11758. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Mark Yassa's phone number?
The number on file is (516) 393-1000. Contact the office directly to confirm availability and scheduling.
NPI registry
What is Mark Yassa's NPI number?
Mark Yassa's National Provider Identifier is 1922488618. 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
Where did Mark Yassa train?
Mark Yassa attended Other, graduating in 2015. This comes from the CMS National Downloadable File.
CMS public data
How long has Mark Yassa been practicing?
Mark Yassa has 11 years experience. Calculated from a graduation year of 2015, reported in the CMS National Downloadable File.
CMS public data
What does Mark Yassa do most often?
According to Medicare billing data, Mark Yassa the Medicare record under this individual NPI shows mainly office visits and diagnostic testing. Hospital-based physicians usually have their procedural work billed by the facility rather than under their own number, so this is a floor on their practice, not a description of it. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Mark Yassa confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Mark Yassa. If this is you, claiming it is free.
Guide.md
Guide.md listings do not constitute medical advice or an endorsement.