Arthrocentesis
Arthrocentesis, [right / left] [knee / shoulder / hip / ankle], [with / without] ultrasound guidance
[Right / Left] [knee / shoulder / hip / ankle] effusion [with [fever / leukocytosis / elevated CRP / trauma]] concerning for [septic arthritis / gout / pseudogout / inflammatory arthritis / traumatic effusion] requiring arthrocentesis for diagnosis and symptomatic relief.
Informed consent was obtained from the [patient / patient's surrogate] after discussion of risks, including infection, bleeding, joint injury, and vasovagal reaction, as well as benefits and alternatives.
[***, MD/DO]
Local: [X] mL 1% lidocaine to the skin and subcutaneous tissue
[X] mL of [clear / cloudy / yellow / bloody / purulent] synovial fluid was aspirated.
A time-out was completed confirming the patient, procedure, and side. The patient was positioned [supine / seated] with the [right / left] [knee / shoulder / hip / ankle] in [mild flexion / abduction / neutral position]. The entry site was identified by [palpation of landmarks / ultrasound] for a [medial / lateral / anterior / posterior] approach. The skin was prepped with [chlorhexidine / povidone-iodine], and [X] mL of 1% lidocaine was infiltrated into the skin and subcutaneous tissue.
A needle of [18 / 20 / 22] gauge was advanced into the [joint space / suprapatellar pouch / glenohumeral joint] [using palpation landmarks / under real-time ultrasound guidance with visualization of the needle tip]. Entry into the joint was confirmed by return of synovial fluid, and the joint was aspirated. [[[X] mg triamcinolone with [X] mL 0.5% bupivacaine / [X] mg hyaluronic acid] was injected after aspiration, with infection not suspected based on fluid appearance and clinical assessment.]
The needle was removed, gentle pressure was applied, and a bandage was placed.
Minimal
Synovial fluid for cell count with differential, crystal analysis, Gram stain, and culture
None
The patient tolerated the procedure well and [will be discharged home / remains admitted for further management]. Synovial fluid cell count, crystal analysis, and culture results will be followed.
Epic SmartPhrase Version
PROCEDURE: Arthrocentesis, [right / left] [knee / shoulder / hip / ankle], [with / without] ultrasound guidance
INDICATION: [Right / Left] [knee / shoulder / hip / ankle] effusion [with ***] concerning for [septic arthritis / gout / pseudogout / inflammatory arthritis / traumatic effusion] requiring arthrocentesis for diagnosis and symptomatic relief.
CONSENT: Informed consent obtained from the [patient / surrogate] after discussion of risks, including infection, bleeding, joint injury, and vasovagal reaction, benefits, and alternatives.
PERFORMED BY: ***, MD/DO
ANESTHESIA: Local: *** mL 1% lidocaine to skin and subcutaneous tissue
FINDINGS: *** mL [clear / cloudy / yellow / bloody / purulent] synovial fluid aspirated.
PROCEDURE DETAILS:
Time-out completed. Patient [supine / seated], [right / left] [knee / shoulder / hip / ankle] positioned [in mild flexion / in abduction / neutral]. Site identified by [palpation / ultrasound], [medial / lateral / anterior / posterior] approach. Skin prepped with [chlorhexidine / povidone-iodine]. *** mL 1% lidocaine to skin and subcutaneous tissue. [18 / 20 / 22]-gauge needle advanced into [joint space / suprapatellar pouch / glenohumeral joint] [by palpation landmarks / under real-time ultrasound with needle tip visualization]. Synovial fluid return confirmed, joint aspirated. [*** mg triamcinolone with *** mL 0.5% bupivacaine injected after aspiration, infection not suspected.] Needle removed, pressure applied, bandage placed.
EBL: Minimal
SPECIMENS: Synovial fluid for cell count with differential, crystal analysis, Gram stain, and culture
COMPLICATIONS: None
POST-PROCEDURE PLAN: Tolerated well. [Discharged home / Remains admitted for further management]. Synovial fluid results to be followed.
Signed: .ME, .MYDEGREE
.TODAYVariants
Septic Arthritis (Bedside vs. OR)
Synovial fluid analysis showed [X] WBC/mm3 with [X]% PMNs[ and a positive Gram stain], consistent with septic arthritis. Operative irrigation and debridement is planned [emergently / urgently] rather than serial aspiration.
Hip Arthrocentesis
The hip joint was aspirated under [ultrasound / fluoroscopic] guidance through an [anterior / lateral] approach. The needle was advanced to a depth of [X] cm to enter the joint.
Shoulder (Glenohumeral) Arthrocentesis
The glenohumeral joint was entered through a [posterior / anterior] approach [using the posterior portal landmark / under ultrasound guidance].
Charting Tips
- Document joint aspirated, laterality, and approach (medial, lateral, anterior, posterior)
- State volume and appearance of synovial fluid aspirated
- List all studies sent on the fluid (cell count, crystal, culture at minimum)
- Document whether corticosteroid or hyaluronic acid was injected and the drug/dose. Explicitly state that infection was excluded before injection. Do not inject corticosteroid if septic arthritis is suspected. Also document relative contraindications considered:
- Recent prior injection (<3 months same joint)
- Overlying cellulitis
- Bacteremia
- Uncontrolled diabetes
- WBC >50,000/mm3 is highly suggestive of septic arthritis but sensitivity is only ~60-70% (Margaretten JAMA 2007). Lower counts do not exclude infection, particularly in gonococcal arthritis, early infection, or prosthetic joints (where threshold is much lower, approximately 1,100-3,000 cells/uL). Clinical suspicion (fever, inability to bear weight, rapid onset monoarthritis) should drive management regardless of cell count.
- Needle size by joint and fluid. Use 18-gauge for a knee with viscous or purulent fluid, 20-gauge for a standard knee or shoulder, and 22-gauge for the shoulder, hip, or small joints.
- If septic arthritis is confirmed (WBC >50,000, PMN >75%, positive Gram stain), formal OR washout and irrigation is generally indicated rather than serial aspirations. Document the urgency of disposition after results return.
- The hip joint is deep. Ultrasound or fluoroscopic guidance is strongly preferred. Document approach, guidance modality, and depth of needle insertion.
- For the glenohumeral joint, use the posterior approach (posterior portal landmark) or the anterior approach. Ultrasound guidance reduces the risk of needle passage through the rotator cuff. Document approach and landmarks.
Documentation & Reimbursement Considerations
- Primary service: Report Arthrocentesis as the primary service when it is the definitive operation performed.
- Joint size and whether real-time ultrasound guidance with a permanent recording was used determine the code. Without ultrasound, major joints (knee, shoulder, hip, sacroiliac) are 0.77 wRVU, intermediate joints (wrist, elbow, TMJ) 0.66 wRVU, and small joints (finger, toe) 0.64 wRVU. With ultrasound, major joints are 1.07 wRVU and intermediate joints 0.98 wRVU, all with a 0-day global.
- When ultrasound guides the aspiration, report the arthrocentesis service that includes ultrasound rather than adding a separate ultrasound guidance code. Since 2015, ultrasound guidance has been bundled into these services and is no longer separately billable.
- Aspiration and injection of corticosteroid or hyaluronic acid at the same session are covered by a single arthrocentesis service. Do not separately bill for the injection procedure. The drug itself (J-code) is separately billable as a supply.
- 0-day global period: follow-up visits after arthrocentesis are fully separately billable with standard E/M codes. There is no bundled postoperative period.
- If performed in the office, the associated E/M visit may need a modifier confirming that a significant, separately identifiable evaluation and management service was provided on the same day as the procedure. Confirm payer policy.