Doctor profile · Federal record
Dr. Karen Mrejen, MD
Pulmonary Disease Physician (CMS: Pulmonary Disease) · Rockville Centre, NY
- NPI 1902999212
- Accepts Medicare
- MIPS 85.0 / 100 · 2023
- 31 yrs in practice
- Female
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
200 N Village Ave, Suite 300
Rockville Centre, NY 115702341
(516) 536-8151
fax (516) 536-8153
Credentials & registration
- NPI registered
- October 2006 — 20 yrs on file
- Profile last updated
- November 14, 2013
- Year of graduation
- 1995 — 31 yrs since
- Specialty taxonomy
- 207RP1001X — NUCC code
- State license (1)
- New York #224857
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1902999212. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,418
Distinct HCPCS
10
Medicare allowed
$141,508
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 339 | 199 | $106 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 200 | 157 | $149 | |
99215 |
Established patient office or other outpatient visit, 40-54 minutes | 99 | 86 | $209 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 78 | 78 | $196 | |
94010 |
Test to measure expiratory airflow and volume | 74 | 73 | $32 | |
85018 |
Blood count, hemoglobin | 60 | 60 | $2 | |
94727 |
Test to determine lung volumes using gas dilution or washout | 60 | 60 | $52 | |
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 60 | 42 | $91 | |
94729 |
Test to examine how well the lungs exchange gases | 59 | 59 | $68 | |
99212 |
Established patient office or other outpatient visit, 10-19 minutes | 56 | 48 | $67 |
In context: peer comparison
Among 4 peers in this city , average services per provider: 161. This provider delivers 8.8× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
1,848
Patients
765
Total drug cost
$511,187
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Albuterol Sulfate Hfa (Albuterol Sulfate) | Brand | 404 | 174 | $16,691 |
| Azithromycin | Generic | 231 | 83 | $2,152 |
| Breo Ellipta (Fluticasone/Vilanterol) | Brand | 171 | 63 | $113,557 |
| Trelegy Ellipta (Fluticasone/Umeclidin/Vilanter) | Brand | 141 | 52 | $191,056 |
| Montelukast Sodium | Generic | 138 | 59 | $2,644 |
| Prednisone | Generic | 137 | 60 | $1,107 |
| Symbicort (Budesonide/Formoterol Fumarate) | Brand | 94 | 42 | $65,868 |
| Famotidine | Generic | 86 | 51 | $764 |
| Methylprednisolone | Generic | 86 | 59 | $605 |
| Azelastine Hcl | Generic | 78 | 27 | $2,844 |
Hospital affiliations
Frequently asked questions
What is Dr. Karen Mrejen's medical specialty?
Dr. Karen Mrejen practices Pulmonary Disease Physician in Rockville Centre, NY.
Where does Dr. Karen Mrejen practice?
Dr. Karen Mrejen practices at 200 N Village Ave, Rockville Centre, NY 115702341. Office phone: 5165368151.
What is Dr. Karen Mrejen's NPI?
Dr. Karen Mrejen's National Provider Identifier (NPI) is 1902999212, issued by NPPES.
Does Dr. Karen Mrejen accept Medicare assignment?
Yes. Dr. Karen Mrejen accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Karen Mrejen commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99213); Established patient office or other outpatient visit (HCPCS 99214); Established patient office or other outpatient visit (HCPCS 99215). Source: CMS Medicare Physician & Other Practitioners file.