Quick answers
- Does Shannon L. Messerges accept Medicare assignment?
- Yes. Medicare's clinician data says Shannon L. Messerges 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 Shannon L. Messerges see?
- In 2024, CMS data shows 43 Original Medicare patients and 383 services for Shannon L. Messerges. This counts Original Medicare only and measures volume, not quality.
- What is Shannon L. Messerges's NPI number?
- 1528430725. 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 Shannon L. Messerges, 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 | 43 |
|---|---|
| Services billed to Medicare | 383 |
| Different services or procedures | 19 |
| Participating Medicare provider | Yes |
| Average age of these patients | 71 |
Most frequent services
- Psychotherapy with evaluation and management visit, 30 minutes (90833)129 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)98 services
- Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)70 services
- Psychotherapy with evaluation and management visit, 45 minutes (90836)36 services
- Psychiatric diagnostic evaluation with medical services (90792)17 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 cholesterol75%
- Anxiety75%
- High blood pressure70%
- Depression70%
- Arthritis44%
- Diabetes37%
Practice locations
Addresses where Shannon L. Messerges is enrolled with Medicare (CMS data updated October 2, 2026).
- 175 Fore River PkwyPortland, ME 04102 (207) 879‑3000
- 25 N Winfield Rd, Suite 405Winfield, IL 60190 (630) 545‑7565
Group practices
Medicare enrollment lists Shannon L. Messerges as a member of these groups (CMS data updated October 2, 2026).
- Dupage Medical Group Ltd1,322 clinicians in the group
- Mercy Hospital301 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Portland
Clinicians with the same Medicare primary specialty in Portland, ME — not a recommendation.
Other clinicians in Dupage Medical Group Ltd
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Graduation year | 2023 |
|---|---|
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1528430725 |
| 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
- 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