DR. ROBERT WILLIAM ZIERING (M.D.) – Allergy & Immunology Physician, NPI 1215933148
Allergy & Immunology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
525 ALLERGY/IMMUNOLOGY in CA
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Provider Addresses for DR. ROBERT WILLIAM ZIERING (M.D.)
2067, West Vista Way, Vista, San Diego County, California, 92083, United States
STE 140
VISTA, CA 920836032
Phone: (760) 941-4444
Fax: (760) 941-8902
Mailing address matches the actual address.
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 167 Open Payments records for all available years, with a total value of $3,943.
Total Amount is formed as General ($3,943) + Research ($0) + Ownership ($0) = $3,943.
Last reported payment date: 2024-12-19 • Largest payer in this snapshot: GENZYME CORPORATION ($645).
Total Amount
$3,943
General + Research + Ownership
Payments
167
Total payment records
General Amount
$3,943
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-19
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| GENZYME CORPORATION | $645 |
| GlaxoSmithKline, LLC. | $556 |
| AstraZeneca Pharmaceuticals LP | $339 |
| Amgen Inc. | $235 |
| Takeda Pharmaceuticals U.S.A., Inc. | $183 |
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: 2010-11-11
PECOS data refreshed: 2026-06-15
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 |
|---|---|---|---|---|
| I20101111000100 | I | Allergy/Immunology | 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 |
|---|---|---|---|---|
| 95165 | Professional service for preparation and provision of 1 or more antigens | 6,850 | 116 | $0 |
| 95004 | Test for allergy using allergenic extract | 3,662 | 47 | $0 |
| 95117 | Professional service for multiple injections of allergen | 1,721 | 109 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 387 | 246 | $0 |
| 95115 | Professional service for single injection of allergen | 273 | 28 | $0 |
Insurance plans in this area (ZIP 92083)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| ALLERGY/IMMUNOLOGY | CA | 95117 | Injection of incremental dosages of allergen, 2 or more injections | 1367 | 86 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Allergy/Immunology, Internal Medicine | CA | |
| Allergy/Immunology, Pediatric Medicine | CA | |
| Nurse Practitioner | CA | |
| A L L E R G Y/ I M M U N O L O G Y | CA | |
| Internal Medicine | AZ | |
| Physician Assistant | CA | |
| A L L E R G Y/ I M M U N O L O G Y | CA | |
| Internal Medicine, Allergy/Immunology | AZ | |
| Allergy/Immunology, Internal Medicine | FL | |
| Nurse Practitioner | CA |
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