Quick answers
- Does Marcie O. Wertlieb accept Medicare assignment?
- Yes. Medicare's clinician data says Marcie O. Wertlieb 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 Marcie O. Wertlieb see?
- In 2024, CMS data shows 946 Original Medicare patients and 7,776 services for Marcie O. Wertlieb. This counts Original Medicare only and measures volume, not quality.
- What is Marcie O. Wertlieb's NPI number?
- 1396745840. 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 Marcie O. Wertlieb, 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 | 946 |
|---|---|
| Services billed to Medicare | 7,776 |
| Different services or procedures | 28 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Microfluid analysis of tears (83861)2,638 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)1,144 services
- Imaging of retina (92134)799 services
- Exam of visual field with extended testing (92083)647 services
- Photography of the retina (92250)604 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%
- High blood pressure73%
- Arthritis41%
- Diabetes32%
- Chronic kidney disease23%
- Ischemic heart disease20%
Practice locations
Addresses where Marcie O. Wertlieb is enrolled with Medicare (CMS data updated October 2, 2026).
- 14201 Laurel Park Dr, Suite 208Laurel, MD 20707 (301) 498‑6616
Group practices
Medicare enrollment lists Marcie O. Wertlieb as a member of this group (CMS data updated October 2, 2026).
- Ronald S. Oser, MD, PA2 clinicians in the group
Specialties
- Ophthalmologyprimary
Other ophthalmologists in Laurel
Clinicians with the same Medicare primary specialty in Laurel, MD — not a recommendation.
Other clinicians in Ronald S. Oser, MD, PA
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Maryland School Of Medicine |
| Graduation year | 2001 (25 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1396745840 |
| 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