Quick answers
- Does Joseph B. Harlan Jr. accept Medicare assignment?
- Yes. Medicare's clinician data says Joseph B. Harlan Jr. 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 Joseph B. Harlan Jr. see?
- In 2024, CMS data shows 1,540 Original Medicare patients and 10,770 services for Joseph B. Harlan Jr.. This counts Original Medicare only and measures volume, not quality.
- What is Joseph B. Harlan Jr.'s NPI number?
- 1861442709. 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 Joseph B. Harlan Jr., 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 | 1,540 |
|---|---|
| Services billed to Medicare | 10,770 |
| Different services or procedures | 40 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Imaging of retina (92134)2,733 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)1,629 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)1,230 services
- Injection of drug into eye (67028)1,128 services
- Injection, aflibercept hd, 1 mg (J0177)1,048 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%
- Arthritis47%
- Diabetes42%
- Ischemic heart disease30%
- Chronic kidney disease28%
Practice locations
Addresses where Joseph B. Harlan Jr. is enrolled with Medicare (CMS data updated October 2, 2026).
- 1209 York RdLutherville, MD 21093 (410) 821‑9490
- 301 Saint Paul St, Suite 902Baltimore, MD 21202 (410) 727‑8380
Group practices
Medicare enrollment lists Joseph B. Harlan Jr. as a member of this group (CMS data updated October 2, 2026).
- Katzen Medical Associates PC23 clinicians in the group
Specialties
- Ophthalmologyprimary
Other ophthalmologists in Lutherville
Clinicians with the same Medicare primary specialty in Lutherville, MD — not a recommendation.
Other clinicians in Katzen Medical Associates PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Johns Hopkins University School Of Medicine |
| Graduation year | 1994 (32 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1861442709 |
| 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