Doctor profile · Federal record
Dr. John Timmerman, MD
Hematology & Oncology Physician (CMS: Hematology/Oncology) · Internal Medicine Physician · Los Angeles, CA
- NPI 1891715090
- Accepts Medicare
- MIPS 84.9 / 100 · 2023
- 35 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
200 Medical Plaza, #365,530,420,120
Los Angeles, CA 900953075
(310) 794-5511
fax (310) 206-5511 - Mailing address
-
5767 W Century Blvd, Suite 200
Los Angeles, CA 900455632
Credentials & registration
- NPI registered
- July 2006 — 20 yrs on file
- Profile last updated
- January 23, 2013
- Year of graduation
- 1991 — 35 yrs since
- Specialty taxonomy
- 207RH0003X — NUCC code
- State licenses (2)
- California #G76297 · California #G76297A
- Medicaid
- CA #00G762970
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1891715090. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
490
Distinct HCPCS
9
Medicare allowed
$37,437
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
85025 |
Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count | 84 | 56 | $8 | |
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 81 | 12 | $127 | |
80053 |
Blood test, comprehensive group of blood chemicals | 70 | 51 | $10 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 64 | 33 | $141 | |
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 62 | 14 | $85 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 47 | 33 | $69 | |
83615 |
Lactate dehydrogenase (enzyme) level | 33 | 21 | $6 | |
99215 |
Established patient office or other outpatient visit, 40-54 minutes | 33 | 18 | $197 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 16 | 14 | $96 |
In context: peer comparison
Among 50 peers in Los Angeles Hematology & Oncology Physician, average services per provider: 1,244. This provider delivers 0.4× the peer median.Open Payments
Industry payments received
All-time total
$83
Transactions
1
Manufacturers
1
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Kite Pharma, INC. | 1 | $83.01 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
12
Patients
0
Total drug cost
$244,405
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Imbruvica (Ibrutinib) | Brand | 12 | 0 | $244,405 |
Hospital affiliations
Frequently asked questions
What is Dr. John Timmerman's medical specialty?
Dr. John Timmerman practices Hematology & Oncology Physician in Los Angeles, CA.
Where does Dr. John Timmerman practice?
Dr. John Timmerman practices at 200 Medical Plaza, Los Angeles, CA 900953075. Office phone: 3107945511.
What is Dr. John Timmerman's NPI?
Dr. John Timmerman's National Provider Identifier (NPI) is 1891715090, issued by NPPES.
Does Dr. John Timmerman accept Medicare assignment?
Yes. Dr. John Timmerman accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. John Timmerman commonly perform?
Top Medicare-reported procedures in 2023: Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (HCPCS 85025); Subsequent hospital care with moderate levelof medical decision making (HCPCS 99233); Blood test, comprehensive group of blood chemicals (HCPCS 80053). Source: CMS Medicare Physician & Other Practitioners file.