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Edit this profileWhere to find Leonard T. Onsen
- Los Angeles location main office
6801 Park Ter Ste 400, Los Angeles, CA 90045 - Chicago location
1740 W Taylor St, Chicago, IL 60612
About Leonard Onsen
Based in Los Angeles, CA, Leonard T. Onsen is listed in the NPI registry under sports medicine. Leonard is also listed as specializing in orthopaedic sports medicine and orthopaedic surgery. Medicare claims data shows Leonard provided 1,909 services to 157 patients. The services billed most often include injection, methylprednisolone acetate, 1 mg, new patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more, and established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more. NPI 1104321421 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
- (310) 665-7200
- Email not available
Practice Locations
6801 PARK TER STE 400
Los Angeles, CA 90045
1740 W Taylor St
Chicago, IL 60612
Conditions Commonly Evaluated or Treated
Within Sports Medicine generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
Bone
Bone injuries
Chest and torso
Elbow & Arm
Foot & Ankle
Foot and ankle
Hand & Wrist
Hand and wrist
Hip & Thigh
- Groin Strain
- Hip labral tear
- Lateral hip pain and trochanteric bursitis
- Muscle strain
- Snapping Hip Syndrome
- Sports Hernia
Joint injuries
Joint pain
Knee
Lower Leg
Muscle and tendon injuries
Nerve pain
Pediatric & Teen Sports
Shoulder
Shoulder injuries
Spine & Back
Sports health
Sprains and tears
Procedures & services
Most searched procedures
Bracing and support
Consultations
Diagnostics
Exams & Clearance
Injections
Injections & Pain Relief
- Bursa Aspiration And Injection
- Joint injection or aspiration
- Knee Fluid Drainage
- Knee Joint Injection
- Nerve Hydrodissection
- Trigger Point Injections
Injury management
Pain management
Performance & Assessment
Performance and testing
- DEXA Body Composition Scan
- Professional Bike Fitting
- Resting Metabolic Rate Test
- Running Form Coaching
Recovery therapy
Regenerative & Advanced Therapy
Regenerative medicine
Rehab & Recovery
- Active release technique
- Blood flow restriction therapy
- Cupping Therapy
- Dry needling
- Exercise Prescription
- Muscle Scraping
- Sports Physical Therapy
Rehabilitation
Support & Bracing
Procedures Most Often Billed to Medicare
1,909 services · 157 patients · 5 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Aspiration and/or injection of fluid from large joint | Procedure | 20610 |
22 | Less often than most peers in Sports Medicine |
| Injection, methylprednisolone acetate, 1 mg | Drug given | J1010 |
1,760 | Less often than most peers in Sports Medicine |
| New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more | Office visit | 99204 |
72 | More often than most peers in Sports Medicine |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
43 | Less often than most peers in Sports Medicine |
| Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | Office visit | 99222 |
12 | Less often than most peers in Sports Medicine |
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.
Other sports medicine doctors at this location 2
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 8
Clinically related specialties at the same address — the people this provider most likely works alongside.
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.
More connections — 30 related providers in 4 groups
Other sports medicine doctors in Los Angeles 6
Same specialty, same city.
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
Class of 2018 at Other 8
Providers who graduated from the same medical school in the same year.
Also performs Aspiration and/or injection of fluid from large joint 8
Providers in CA who bill this service to Medicare most often.
Common questions
What does Leonard T. Onsen specialize in?
Leonard T. Onsen is a sports medicine doctor in Los Angeles, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Sports Medicine”.
NPI registry
Where is Leonard T. Onsen located?
Leonard T. Onsen is listed at 6801 Park Ter Ste 400, Los Angeles, CA 90045. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Leonard T. Onsen's phone number?
The number on file is (310) 665-7200. Contact the office directly to confirm availability and scheduling.
NPI registry
What is the NPI for Leonard T. Onsen?
Leonard T. Onsen's National Provider Identifier is 1104321421. 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 Leonard T. Onsen train?
Leonard T. Onsen attended Other, graduating in 2018. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Leonard T. Onsen have?
Leonard T. Onsen has 8 years experience. Calculated from a graduation year of 2018, reported in the CMS National Downloadable File.
CMS public data
What does Leonard T. Onsen do most often?
According to Medicare billing data, Leonard T. Onsen performs procedures including aspiration and/or injection of fluid from large joint, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Leonard T. Onsen's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Leonard T. Onsen. If this is you, claiming it is free.
Guide.md
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