Leah Mergen, PA-C
NPI 1023389392 · Physician Assistant · Sioux Falls, SD
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Leah Mergen, PA-C is a Physician Assistant provider in Sioux Falls, SD (NPI 1023389392).
Provider details
- NPI number
- 1023389392
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C
- Sex
- Female
- Sole proprietor
- No
- License
- 0799 (SD)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
14 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
228 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 102 | $78 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 92 | $54 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 34 | $106 |
Typical Medicare-allowed amounts for these services range $54–$106 (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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 66 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 175 | 49 |
| Levothyroxine Sodium | 131 | 30 |
| Omeprazole | 108 | 27 |
| Losartan Potassium | 98 | 18 |
| Lisinopril | 90 | 24 |
| Pantoprazole Sodium | 81 | 16 |
| Alendronate Sodium | 75 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2012-01-19
- Last updated
- 2017-08-29
Frequently asked questions
- What is Leah Mergen's NPI number?
- Leah Mergen's National Provider Identifier (NPI) is 1023389392, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Leah Mergen's specialty?
- Leah Mergen is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Leah Mergen located?
- Leah Mergen's practice location on file with NPPES is 521 N Main Ave Ste 100, Sioux Falls, SD 57104-5947.
- What is Leah Mergen's phone number?
- The practice phone number listed in the NPPES registry for Leah Mergen is (605) 367-8214.
- Does Leah Mergen accept Medicare?
- Leah Mergen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Leah Mergen's NPI active?
- Yes — Leah Mergen's NPI (1023389392) is active in the NPPES registry as of the last update on 2017-08-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.