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Edit this profileAt a glance
- 19851 Observation Dr Ste 375, Germantown, MD 20876
About Dr. Kao
Based in Germantown, MD, Leon Kao, MD is listed in the NPI registry under allergy. According to Medicare claims data, Leon cared for 239 Medicare patients across 1,298 services. The services billed most often include test for allergy using allergenic extract, established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more, and new patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more. NPI 1265639728 identifies this record in the national registry.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (301) 972-3709
- Email not available
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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 | Compared with peers |
|---|---|---|---|---|
| Test for allergy using allergenic extract | Treatment | 95004 |
1,020 | As often as other peers in Allergy |
| Test to measure the level of nitric oxide gas | Treatment | 95012 |
44 | As often as other peers in Allergy |
| Test to measure expiratory airflow and volume | Treatment | 94010 |
42 | As often as other peers in Allergy |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
108 | As often as other peers in Allergy |
| 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 | More often than most peers in Allergy |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
24 | Less often than most peers in Allergy |
| 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 | Less often than most peers in Allergy |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
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.
Class of 2001 at Other 8
Providers who graduated from the same medical school in the same year.
More connections — 8 related providers in 1 group
Also performs Test for allergy using allergenic extract 8
Providers in MD who bill this service to Medicare most often.
Common questions
What does Dr. Kao specialize in?
Dr. Kao is an allergy in Germantown, MD. That is the designation recorded for this NPI in the federal registry.
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. Contact the office directly to confirm availability and scheduling.
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 practicing?
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
Guide.md listings do not constitute medical advice or an endorsement.