Doctor profile · Federal record
Dr. John Chafos, MD
Internal Medicine Physician (CMS: Family Practice) · Emergency Medicine Physician · Green Brook, NJ
- NPI 1871673830
- Accepts Medicare
- 38 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
257 Rt 22 East
Green Brook, NJ 08812
(732) 968-8832
fax (732) 968-2187
Credentials & registration
- NPI registered
- October 2006 — 20 yrs on file
- Profile last updated
- March 29, 2011
- Year of graduation
- 1988 — 38 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State license (1)
- New Jersey #25MA05399400
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1871673830. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
5,263
Distinct HCPCS
10
Medicare allowed
$201,245
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 667 | 310 | $97 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 617 | 283 | $136 | |
J1100 |
Injection, dexamethasone sodium phosphate, 1 mg | 592 | 106 | $0 | |
36415 |
Insertion of needle into vein for collection of blood sample | 410 | 226 | $3 | |
J0696 |
Injection, ceftriaxone sodium, per 250 mg | 381 | 71 | $0 | |
96372 |
Injection of drug or substance under skin or into muscle | 367 | 166 | $15 | |
85025 |
Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count | 358 | 209 | $8 | |
81003 |
Automated urinalysis test | 316 | 196 | $2 | |
83036 |
Hemoglobin a1c level | 214 | 143 | $10 | |
87428 |
Detection test by immunoassay technique for severe acute respiratory syndrome coronavirus and influenza | 198 | 161 | $31 |
In context: peer comparison
Among 2 peers in this city , average services per provider: 121. This provider delivers 43× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
1,621
Patients
931
Total drug cost
$20,682
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Dexamethasone | Generic | 215 | 163 | $750 |
| Prednisone | Generic | 150 | 77 | $807 |
| Atorvastatin Calcium | Generic | 136 | 58 | $1,660 |
| Rosuvastatin Calcium | Generic | 125 | 53 | $3,268 |
| Metformin Hcl | Generic | 119 | 48 | $1,201 |
| Metoprolol Succinate | Generic | 119 | 47 | $2,591 |
| Amlodipine Besylate | Generic | 111 | 50 | $898 |
| Cefdinir | Generic | 108 | 85 | $2,736 |
| Azithromycin | Generic | 107 | 89 | $586 |
| Amoxicillin-Clavulanate Potass (Amoxicillin/Potassium Clav) | Brand | 84 | 70 | $937 |
Frequently asked questions
What is Dr. John Chafos's medical specialty?
Dr. John Chafos practices Internal Medicine Physician in Green Brook, NJ.
Where does Dr. John Chafos practice?
Dr. John Chafos practices at 257 Rt 22 East, Green Brook, NJ 08812. Office phone: 7329688832.
What is Dr. John Chafos's NPI?
Dr. John Chafos's National Provider Identifier (NPI) is 1871673830, issued by NPPES.
Does Dr. John Chafos accept Medicare assignment?
Yes. Dr. John Chafos accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. John Chafos 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); Injection, dexamethasone sodium phosphate, 1 mg (HCPCS J1100). Source: CMS Medicare Physician & Other Practitioners file.