MARK HAAS (M.D.) – Anatomic Pathology & Clinical Pathology Physician, NPI 1750330478
Anatomic Pathology & Clinical Pathology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
1,584 PATHOLOGY in CA
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Provider Addresses for MARK HAAS (M.D.)
Cedar Valley Drive, Westlake Village, Los Angeles County, California, 91361, United States of America
STE 324
WESTLAKE VILLAGE, CA 913627129
Phone: (818) 338-8103
Fax: (818) 338-8119
Type: Mailing
Cedars-Sinai Medical Center, 8700, Beverly Boulevard, West Hollywood, Los Angeles County, California, 90048, United States
LOS ANGELES, CA 900481804
Phone: (818) 338-8103
Fax: (818) 338-8119
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 37 Open Payments records for all available years, with a total value of $61,337.
Total Amount is formed as General ($61,337) + Research ($0) + Ownership ($0) = $61,337.
Last reported payment date: 2024-12-17 • Largest payer in this snapshot: AstraZeneca UK Limited ($27,675).
Total Amount
$61,337
General + Research + Ownership
Payments
37
Total payment records
General Amount
$61,337
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-17
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| AstraZeneca UK Limited | $27,675 |
| Novartis Pharmaceuticals Corporation | $13,044 |
| ARGENX US, INC. | $9,025 |
| Otsuka Pharmaceutical Development & Commercialization, Inc. | $8,415 |
| Travere Therapeutics, Inc. | $3,152 |
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: 2009-07-24
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 |
|---|---|---|---|---|
| I20090724000235 | I | Pathology | CA | 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 |
|---|---|---|---|---|
| 88350 | Antibody evaluation, each additional single antibody stain procedure | 837 | 93 | $0 |
| 88313 | Special stained specimen slides to examine tissue including interpretation and report | 318 | 100 | $0 |
| 88305 | Pathology examination of tissue using a microscope, intermediate complexity | 111 | 94 | $0 |
| 88346 | Antibody evaluation, initial single antibody stain procedure | 98 | 93 | $0 |
| 88348 | Electron microscopy for diagnosis | 88 | 83 | $0 |
Insurance plans in this area (ZIP 91362)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| PATHOLOGY | CA | 88342 | Tissue or cell analysis by immunologic technique | 66 | 61 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| P A T H O L O G Y | NY | |
| A N E S T H E S I O L O G Y | NV | |
| - | CA | |
| - | CA | |
| - | CA | |
| H O S P I T A L I S T | CA | |
| Infectious Disease | CA | |
| Plastic And Reconstructive Surgery | CA | |
| Physical Therapist In Private Practice | CA | |
| Hospitalist, Internal Medicine | CA |
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