Physician Profile
Unclaimed ProfileAbout KAO
Based in Germantown, MD, Leon Kao, MD is listed in the NPI registry under allergy/immunology. Leon is also listed as specialising in allergy.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Common questions
What does Dr. Kao specialise in?
Dr. Kao is an allergy/immunology in Germantown, MD. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “ALLERGY/IMMUNOLOGY”.
NPI registry
Where is Dr. Kao located?
Dr. Kao is listed at 19851 OBSERVATION DR STE 375, Germantown, MD 20876. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Kao's phone number?
The number on file is (301) 972-3709. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Kao's NPI number?
Dr. Kao's National Provider Identifier is 1265639728. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Kao go to medical school?
Dr. Kao attended Other, graduating in 2001. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Kao been practising?
Dr. Kao has 25 years experience. Calculated from a graduation year of 2001, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Kao do most often?
According to Medicare billing data, Dr. Kao provides treatments such as test for allergy using allergenic extract and test to measure the level of nitric oxide gas, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Kao confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Kao. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (301) 972-3709
- Email not available
Practice Locations
19851 OBSERVATION DR STE 375
Germantown, MD 20876
Procedures Most Often Billed to Medicare
1,298 services · 239 patients · 7 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Test for allergy using allergenic extract | Treatment | 95004 |
1,020 |
| Test to measure the level of nitric oxide gas | Treatment | 95012 |
44 |
| Test to measure expiratory airflow and volume | Treatment | 94010 |
42 |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
108 |
| New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more | Office visit | 99204 |
49 |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
24 |
| New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more | Office visit | 99203 |
11 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
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Claim this profileRelated providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other allergy/immunology specialists at this location 1
Same specialty, same street address — most likely the same department or group.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
More connections — 16 related providers in 2 groups
Class of 2001 at Other 8
Providers who graduated from the same medical school in the same year.
Also performs Test for allergy using allergenic extract 8
Providers in MD who bill this service to Medicare most often.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.