Stephen Liddiard, PA-C
NPI 1164822037 · Surgical Physician Assistant · Dakota Dunes, SD
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stephen Liddiard, PA-C is a Surgical Physician Assistant provider in Dakota Dunes, SD (NPI 1164822037).
Provider details
- NPI number
- 1164822037
- Entity type
- Individual
- Primary specialty
- Surgical Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C
- Sex
- Male
- Sole proprietor
- No
- License
- 075330 (IA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
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
11 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
189 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 | 78 | $106 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 70 | $75 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 41 | $138 |
Typical Medicare-allowed amounts for these services range $75–$138 (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 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Gabapentin | 46 | 24 |
| Oxycodone Hcl | 26 | 18 |
| Tizanidine Hcl | 19 | — |
| Ondansetronbrand: Ondansetron Odt | 17 | 17 |
| Celecoxib | 14 | — |
| Cyclobenzaprine Hcl | 14 | — |
| Diazepam | 13 | 12 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they include cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (1)
- 801 5th StSioux City, IA 51101-1326Phone: (712) 279-2010Fax: (712) 279-2034
Registry dates
- Enumerated
- 2014-08-28
- Last updated
- 2019-07-01
Frequently asked questions
- What is Stephen Liddiard's NPI number?
- Stephen Liddiard's National Provider Identifier (NPI) is 1164822037, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephen Liddiard's specialty?
- Stephen Liddiard is listed in the NPPES registry with a primary specialty of Surgical Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Stephen Liddiard located?
- Stephen Liddiard's practice location on file with NPPES is 575 N Sioux Point Rd, Dakota Dunes, SD 57049-5312.
- What is Stephen Liddiard's phone number?
- The practice phone number listed in the NPPES registry for Stephen Liddiard is (605) 217-2667.
- Does Stephen Liddiard accept Medicare?
- Stephen Liddiard is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stephen Liddiard's NPI active?
- Yes — Stephen Liddiard's NPI (1164822037) is active in the NPPES registry as of the last update on 2019-07-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.