DR. AN L NGUYEN (M.D.) – Allergy & Immunology Physician, NPI 1841559283
Allergy & Immunology Physician
Main info
Doctor Profile
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Profile Insights
NPPES metrics only — not quality of care.
390 ALLERGY/IMMUNOLOGY in TX
Provider Addresses for DR. AN L NGUYEN (M.D.)
1213 HERMANN DR STE 550
HOUSTON, TX 770047089
Phone: (832) 512-4592
Fax: (713) 820-6377
Type: Mailing
1709 Dryden Rd
Houston, TX 770302400
Phone: (713) 798-0190
Fax: (713) 798-0198
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 285 Open Payments records for all available years, with a total value of $6,108.
Total Amount is formed as General ($6,108) + Research ($0) + Ownership ($0) = $6,108.
Last reported payment date: 2024-12-20 • Largest payer in this snapshot: AstraZeneca Pharmaceuticals LP ($788).
Total Amount
$6,108
General + Research + Ownership
Payments
285
Total payment records
General Amount
$6,108
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-20
Latest reported date
Top Companies
Largest payers in this snapshot
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: 2020-02-27
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 |
|---|---|---|---|---|
| I20200227000729 | I | Allergy/Immunology | TX | 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 |
|---|---|---|---|---|
| 95004 | Test for allergy using allergenic extract | 694 | 12 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 53 | 48 | $0 |
| 94010 | Test to measure expiratory airflow and volume | 32 | 27 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 20 | 15 | $0 |
Insurance plans in this area (ZIP 77004)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| A L L E R G Y/ I M M U N O L O G Y | TX | |
| - | TX | |
| Allergy/Immunology, Internal Medicine | TX | |
| Allergy/Immunology, Internal Medicine | TX |
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