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Official Description

Application of a modality to 1 or more areas; diathermy (eg, microwave)

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

Diathermy is a therapeutic procedure that employs high-frequency electrical currents, specifically from shortwave, microwave, or ultrasound sources, to stimulate tissue molecules and produce heat beneath the skin's surface. This technique is designed to enhance the body's natural healing processes by increasing blood flow to the targeted area, which can lead to a reduction in inflammation, stiffness, and pain. The application of diathermy can improve flexibility in joints and connective tissues, making it a valuable treatment option for various musculoskeletal conditions. The electrical energy used in diathermy can be delivered in two primary ways: through electrodes that are placed directly on the skin or via a probe or applicator that beams energy to the desired area. This method of treatment is capable of penetrating tissues to a depth of approximately 2 inches, effectively reaching deeper structures without causing thermal injury to the skin. Diathermy is commonly indicated for conditions such as osteoarthritis, rheumatoid arthritis, sprains, strains, and sinusitis, providing relief and promoting recovery in affected areas.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

Diathermy is indicated for a variety of conditions that benefit from increased blood flow and reduced inflammation. The following are the explicitly provided indications for the use of diathermy:

  • Osteoarthritis - A degenerative joint disease characterized by the breakdown of cartilage, leading to pain and stiffness.
  • Rheumatoid Conditions - Autoimmune disorders that cause chronic inflammation in the joints and surrounding tissues.
  • Sprains - Injuries to ligaments caused by overstretching or tearing, often resulting in pain and swelling.
  • Strains - Injuries to muscles or tendons due to overstretching or tearing, leading to pain and limited mobility.
  • Sinusitis - Inflammation of the sinuses, which can cause pain, pressure, and congestion.

2. Procedure

The procedure for diathermy involves several key steps to ensure effective treatment. The following outlines the procedural steps:

  • Step 1: Patient Preparation - The patient is positioned comfortably to allow access to the area requiring treatment. The skin over the treatment area may be cleaned to ensure proper electrode contact and to enhance the effectiveness of the diathermy application.
  • Step 2: Application of Electrodes or Probe - Depending on the type of diathermy being used, either electrodes are placed directly on the skin or a probe/applicator is positioned above the target area. The choice of method will depend on the specific condition being treated and the depth of tissue penetration required.
  • Step 3: Delivery of Electrical Energy - The diathermy machine is activated, delivering high-frequency electrical currents to the targeted tissues. The energy penetrates the skin and heats the underlying tissues, promoting increased blood flow and tissue relaxation.
  • Step 4: Monitoring - Throughout the procedure, the clinician monitors the patient for comfort and any adverse reactions. The duration of the treatment session is typically determined based on the specific condition and the patient's response to the therapy.
  • Step 5: Completion and Removal - Once the treatment session is complete, the electrical energy is turned off, and the electrodes or probe are carefully removed. The treated area may be assessed for any immediate effects, and the patient is provided with post-procedure instructions.

3. Post-Procedure

After the diathermy procedure, patients may experience immediate relief from pain and stiffness in the treated area. It is important for patients to follow any post-procedure care instructions provided by the clinician, which may include recommendations for rest, hydration, and gentle movement to maintain flexibility. Patients should be advised to monitor the treated area for any signs of adverse reactions, such as increased swelling or discomfort. Follow-up appointments may be scheduled to assess the effectiveness of the treatment and to determine if additional sessions are necessary for optimal recovery.

Short Descr DIATHERMY EG MICROWAVE
Medium Descr APPLICATION MODALITY 1/> AREAS DIATHERMY
Long Descr Application of a modality to 1 or more areas; diathermy (eg, microwave)
Status Code Active Code
Global Days XXX - Global Concept Does Not Apply
PC/TC Indicator (26, TC) 7 - Physical Therapy Service, for which Payment may not be Made
Multiple Procedures (51) 5 - Special payment adjustment rules on the RVU practice expense component of multiple therapy service applies...
Bilateral Surgery (50) 0 - 150% payment adjustment for bilateral procedures does NOT apply.
Physician Supervisions 09 - Concept does not apply.
Assistant Surgeon (80, 82) 0 - Payment restriction for assistants at surgery applies to this procedure...
Co-Surgeons (62) 0 - Co-surgeons not permitted for this procedure.
Team Surgery (66) 0 - Team surgeons not permitted for this procedure.
Diagnostic Imaging Family 99 - Concept Does Not Apply
APC Status Indicator Service Paid under Fee Schedule or Payment System other than OPPS
Type of Service (TOS) 1 - Medical Care
Berenson-Eggers TOS (BETOS) P6C - Minor procedures - other (Medicare fee schedule)
MUE 1
CCS Clinical Classification 213 - Physical therapy exercises, manipulation, and other procedures
GP Services delivered under an outpatient physical therapy plan of care
KX Requirements specified in the medical policy have been met
GY Item or service statutorily excluded, does not meet the definition of any medicare benefit or, for non-medicare insurers, is not a contract benefit
CQ Outpatient physical therapy services furnished in whole or in part by a physical therapist assistant
GO Services delivered under an outpatient occupational therapy plan of care
59 Distinct procedural service: under certain circumstances, it may be necessary to indicate that a procedure or service was distinct or independent from other non-e/m services performed on the same day. modifier 59 is used to identify procedures/services, other than e/m services, that are not normally reported together, but are appropriate under the circumstances. documentation must support a different session, different procedure or surgery, different site or organ system, separate incision/excision, separate lesion, or separate injury (or area of injury in extensive injuries) not ordinarily encountered or performed on the same day by the same individual. however, when another already established modifier is appropriate it should be used rather than modifier 59. only if no more descriptive modifier is available, and the use of modifier 59 best explains the circumstances, should modifier 59 be used. note: modifier 59 should not be appended to an e/m service. to report a separate and distinct e/m service with a non-e/m service performed on the same date, see modifier 25.
CO Outpatient occupational therapy services furnished in whole or in part by an occupational therapy assistant
AT Acute treatment (this modifier should be used when reporting service 98940, 98941, 98942)
25 Significant, separately identifiable evaluation and management service by the same physician or other qualified health care professional on the same day of the procedure or other service: it may be necessary to indicate that on the day a procedure or service identified by a cpt code was performed, the patient's condition required a significant, separately identifiable e/m service above and beyond the other service provided or beyond the usual preoperative and postoperative care associated with the procedure that was performed. a significant, separately identifiable e/m service is defined or substantiated by documentation that satisfies the relevant criteria for the respective e/m service to be reported (see evaluation and management services guidelines for instructions on determining level of e/m service). the e/m service may be prompted by the symptom or condition for which the procedure and/or service was provided. as such, different diagnoses are not required for reporting of the e/m services on the same date. this circumstance may be reported by adding modifier 25 to the appropriate level of e/m service. note: this modifier is not used to report an e/m service that resulted in a decision to perform surgery. see modifier 57 for significant, separately identifiable non-e/m services, see modifier 59.
51 Multiple procedures: when multiple procedures, other than e/m services, physical medicine and rehabilitation services or provision of supplies (eg, vaccines), are performed at the same session by the same individual, the primary procedure or service may be reported as listed. the additional procedure(s) or service(s) may be identified by appending modifier 51 to the additional procedure or service code(s). note: this modifier should not be appended to designated "add-on" codes (see appendix d).
GA Waiver of liability statement issued as required by payer policy, individual case
XS Separate structure, a service that is distinct because it was performed on a separate organ/structure
XU Unusual non-overlapping service, the use of a service that is distinct because it does not overlap usual components of the main service
Date
Action
Notes
2011-01-01 Changed Short description changed.
2009-01-01 Changed Code description changed.
2006-01-01 Changed Code description changed.
Pre-1990 Added Code added.
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