Doctor profile · Federal record
Dr. Leon Kao, MD
Allergy Physician (CMS: Allergy/Immunology) · Germantown, MD
- NPI 1265639728
- Accepts Medicare
- 25 yrs in practice
- Male
- Solo practice
- No sanctions
Practice & contact
- Primary practice
-
19851 Observation Dr Ste 375
Germantown, MD 208764151
(301) 972-3709
fax (301) 515-3612
Credentials & registration
- NPI registered
- June 2007 — 19 yrs on file
- Profile last updated
- September 5, 2022
- Year of graduation
- 2001 — 25 yrs since
- Specialty taxonomy
- 207KA0200X — NUCC code
- State license (1)
- Maryland #D0074337
- Medicaid
- VA #1265639728
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1265639728. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,484
Distinct HCPCS
7
Medicare allowed
$31,541
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
95004 |
Test for allergy using allergenic extract | 1,246 | 32 | $5 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 81 | 59 | $140 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 45 | 45 | $187 | |
95012 |
Test to measure the level of nitric oxide gas | 39 | 29 | $21 | |
94010 |
Test to measure expiratory airflow and volume | 34 | 25 | $29 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 26 | 23 | $102 | |
99203 |
New patient office or other outpatient visit, 30-44 minutes | 13 | 13 | $120 |
In context: peer comparison
Among 1 peers in Germantown Allergy Physician, average services per provider: 212. This provider delivers 7.0× the peer median.Open Payments
Industry payments received
All-time total
$1,689
Transactions
64
Manufacturers
15
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Regeneron Healthcare Solutions, INC. | 15 | $417.09 | |
| Genzyme Corporation | 7 | $331.21 | |
| AstraZeneca Pharmaceuticals Lp | 10 | $212.64 | |
| GlaxoSmithKline, LLC. | 9 | $201.48 | |
| Genentech USA, INC. | 3 | $90.72 | |
| Takeda Pharmaceuticals U.S.A., INC. | 3 | $82.56 | |
| Amgen INC. | 3 | $76.40 | |
| Grifols USA, LLC | 4 | $72.03 | |
| Optinose US, INC. | 3 | $61.89 | |
| Invivyd INC | 1 | $31.10 | |
| Novartis Pharmaceuticals Corporation | 2 | $31.02 | |
| Phadia US INC. | 1 | $23.70 | |
| BioCryst US Sales Co., LLC | 1 | $22.52 | |
| Dermavant Sciences, INC. | 1 | $19.63 | |
| Pfizer INC. | 1 | $15.31 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
253
Patients
51
Total drug cost
$114,804
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Azelastine Hcl | Generic | 30 | 16 | $1,251 |
| Albuterol Sulfate Hfa (Albuterol Sulfate) | Brand | 27 | 0 | $991 |
| Trelegy Ellipta (Fluticasone/Umeclidin/Vilanter) | Brand | 27 | 0 | $29,049 |
| Breo Ellipta (Fluticasone/Vilanterol) | Brand | 24 | 0 | $10,681 |
| Montelukast Sodium | Generic | 24 | 11 | $392 |
| Xolair (Omalizumab) | Brand | 24 | 0 | $70,304 |
| Fluticasone Propionate | Generic | 22 | 11 | $392 |
| Hydroxyzine Hcl | Generic | 22 | 0 | $814 |
| Levocetirizine Dihydrochloride | Generic | 20 | 0 | $499 |
| Ipratropium Bromide | Generic | 17 | 0 | $388 |
Frequently asked questions
What is Dr. Leon Kao's medical specialty?
Dr. Leon Kao practices Allergy Physician in Germantown, MD.
Where does Dr. Leon Kao practice?
Dr. Leon Kao practices at 19851 Observation Dr Ste 375, Germantown, MD 208764151. Office phone: 3019723709.
What is Dr. Leon Kao's NPI?
Dr. Leon Kao's National Provider Identifier (NPI) is 1265639728, issued by NPPES.
Does Dr. Leon Kao accept Medicare assignment?
Yes. Dr. Leon Kao accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Leon Kao commonly perform?
Top Medicare-reported procedures in 2023: Test for allergy using allergenic extract (HCPCS 95004); Established patient office or other outpatient visit (HCPCS 99214); New patient office or other outpatient visit (HCPCS 99204). Source: CMS Medicare Physician & Other Practitioners file.