Hyosun Ahn
NPI 1255820478 · Occupational Therapist · Sunnyvale, CA
Enrolled with Medicare as Practitioner - Occupational Therapist in Private Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Hyosun Ahn is a Occupational Therapist provider in Sunnyvale, CA (NPI 1255820478).
Provider details
- NPI number
- 1255820478
- Entity type
- Individual
- Primary specialty
- Occupational TherapistRespiratory, Developmental, Rehabilitative and Restorative Service Providers
- Sex
- Female
- Sole proprietor
- Yes
- License
- 8597 (CA)
Specialties & taxonomies
Respiratory, Developmental, Rehabilitative and Restorative Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
8 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
503 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Therapy Procedure Using Exercise to Develop Strength, Endurance, Range of Motion, and Flexibility, Each 15 Minutes97110 | 192 | $26 |
| Therapy Procedure Using Functional Activities97530 | 163 | $40 |
| Therapy Procedure to Re-Educate Brain-To-Nerve-To-Muscle Function, Each 15 Minutes97112 | 102 | $31 |
| Training for Self-Care Or Home Management, Each 15 Minutes97535 | 46 | $31 |
Typical Medicare-allowed amounts for these services range $26–$40 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2018-05-03
- Last updated
- 2018-05-03
Frequently asked questions
- What is Hyosun Ahn's NPI number?
- Hyosun Ahn's National Provider Identifier (NPI) is 1255820478, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Hyosun Ahn's specialty?
- Hyosun Ahn is listed in the NPPES registry with a primary specialty of Occupational Therapist (Respiratory, Developmental, Rehabilitative and Restorative Service Providers).
- Where is Hyosun Ahn located?
- Hyosun Ahn's practice location on file with NPPES is 1039 E El Camino Real, Sunnyvale, CA 94087-7719.
- What is Hyosun Ahn's phone number?
- The practice phone number listed in the NPPES registry for Hyosun Ahn is (408) 599-0088.
- Does Hyosun Ahn accept Medicare?
- Hyosun Ahn is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Hyosun Ahn's NPI active?
- Yes — Hyosun Ahn's NPI (1255820478) is active in the NPPES registry as of the last update on 2018-05-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.