MR. HASSAN A AHMAD (M.D) – Allergy & Immunology Physician, NPI 1194138024
Allergy & Immunology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
115 ALLERGY/IMMUNOLOGY in MO
Provider Addresses for MR. HASSAN A AHMAD (M.D)
226 S WOODS MILL RD STE 47W
CHESTERFIELD, MO 630173663
Phone: (314) 205-6600
Fax: (314) 590-5941
Type: Location
14140 SOUTHWEST FWY STE 200
SUGAR LAND, TX 774783842
Phone: (281) 649-7000
Fax: (281) 240-0030
Type: Mailing
16545 SOUTHWEST FWY STE 100
SUGAR LAND, TX 774792919
Phone: (281) 649-7200
Fax: (281) 491-6704
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 115 Open Payments records for all available years, with a total value of $10,910.
Total Amount is formed as General ($10,910) + Research ($0) + Ownership ($0) = $10,910.
Last reported payment date: 2024-12-02 • Largest payer in this snapshot: GENZYME CORPORATION ($7,951).
Total Amount
$10,910
General + Research + Ownership
Payments
115
Total payment records
General Amount
$10,910
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-02
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| GENZYME CORPORATION | $7,951 |
| Intuitive Surgical, Inc. | $1,010 |
| CSL Behring | $455 |
| Regeneron Healthcare Solutions, Inc. | $415 |
| Genentech USA, Inc. | $83 |
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: 2021-07-26
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 |
|---|---|---|---|---|
| I20210726000659 | I | Allergy/Immunology | MO | 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 | 839 | 15 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 91 | 58 | $0 |
| 99204 | New patient office or other outpatient visit, 45-59 minutes | 76 | 76 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 37 | 33 | $0 |
| 99203 | New patient office or other outpatient visit, 30-44 minutes | 24 | 24 | $0 |
Insurance plans in this area (ZIP 63017)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Infectious Disease, Internal Medicine | MO | |
| Nephrology, Internal Medicine | MO | |
| R H E U M A T O L O G Y | MO | |
| - | MO | |
| Rheumatology, Internal Medicine | MO | |
| Internal Medicine | NY | |
| Nurse Practitioner | MO | |
| N E P H R O L O G Y | MO | |
| Nephrology, Internal Medicine | MO | |
| N E P H R O L O G Y | MO |
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