Quick answers
- Does Anissa L. Sonntag accept Medicare assignment?
- Yes. Medicare's clinician data says Anissa L. Sonntag accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Anissa L. Sonntag see?
- In 2024, CMS data shows 523 Original Medicare patients and 1,332 services for Anissa L. Sonntag. This counts Original Medicare only and measures volume, not quality.
- What is Anissa L. Sonntag's NPI number?
- 1033231121. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Anissa L. Sonntag, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 523 |
|---|---|
| Services billed to Medicare | 1,332 |
| Different services or procedures | 28 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)428 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)328 services
- Hospital discharge day management, more than 30 minutes (99239)203 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)153 services
- Critical care, first 30-74 minutes (99291)87 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Arthritis70%
- Ischemic heart disease42%
- Chronic kidney disease41%
- Depression39%
Hospitals where Anissa L. Sonntag works
Medicare's Facility Affiliation Data lists Anissa L. Sonntag at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Citizens Medical CenterColby, KS · Critical Access Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 171362
- Hays Medical CenterHays, KS · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 170013
- Rooks County Health CenterPlainville, KS · Critical Access Hospital · Emergency services: listed by Medicare · CCN 171311
- Russell Regional HospitalRussell, KS · Critical Access Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 171350
- Trego County Lemke Memorial HospitalWakeeney, KS · Critical Access Hospital · Emergency services: listed by Medicare · CCN 171355
Practice locations
Addresses where Anissa L. Sonntag is enrolled with Medicare (CMS data updated October 2, 2026).
- 2220 Canterbury DrHays, KS 67601 (785) 623‑5591
- 3216 Vine St, Suite 20Hays, KS 67601 (785) 261‑7065
Group practices
Medicare enrollment lists Anissa L. Sonntag as a member of this group (CMS data updated October 2, 2026).
- Hays Medical Center Inc191 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Hays
Clinicians with the same Medicare primary specialty in Hays, KS — not a recommendation.
Other clinicians in Hays Medical Center Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 1995 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1033231121 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians