Quick answers
- Does Theresa A. Dyar accept Medicare assignment?
- Yes. Medicare's clinician data says Theresa A. Dyar 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 Theresa A. Dyar see?
- In 2024, CMS data shows 221 Original Medicare patients and 1,112 services for Theresa A. Dyar. This counts Original Medicare only and measures volume, not quality.
- What is Theresa A. Dyar's NPI number?
- 1043404932. 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 Theresa A. Dyar, 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 | 221 |
|---|---|
| Services billed to Medicare | 1,112 |
| Different services or procedures | 40 |
| Participating Medicare provider | Yes |
| Average age of these patients | 71 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)252 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)163 services
- Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month (99490)160 services
- Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)101 services
- Annual depression screening, 5 to 15 minutes (G0444)91 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%
- Arthritis48%
- Diabetes40%
- Depression31%
- Ischemic heart disease30%
Hospitals where Theresa A. Dyar works
Medicare's Facility Affiliation Data lists Theresa A. Dyar 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.
- Fairfield Medical CenterLancaster, OH · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 360072
- Hocking Valley Community HospitalLogan, OH · Critical Access Hospital · Emergency services: listed by Medicare · CCN 361330
- Mount Carmel East & WestColumbus, OH · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 360035
Practice locations
Addresses where Theresa A. Dyar is enrolled with Medicare (CMS data updated October 2, 2026).
- 1941 W Fair AveLancaster, OH 43130 (740) 689‑3627
- 220 E Walnut StLancaster, OH 43130
Group practices
Medicare enrollment lists Theresa A. Dyar as a member of these groups (CMS data updated October 2, 2026).
- Fairfield Community Health Center21 clinicians in the group
- Arbor View Family Medicine Inc.3 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in Lancaster
Clinicians with the same Medicare primary specialty in Lancaster, OH — not a recommendation.
Other clinicians in Fairfield Community Health Center
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | West Virginia School Of Osteopathic Medicine |
| Graduation year | 2007 (19 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1043404932 |
| 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