Coding Ahead
CasePilot
Medical Coding Assistant
CaseConsultant
Instant Email Coding Consultant
Case2Code
Search and Code Lookup Tool
CareerCenter
Medical Coding Job Board
Log in Register free account

Need help choosing the right code?

Ask CasePilot about procedures, modifiers, bundling, and coding guidance.

Try CasePilot

Official Description

Cross intrinsic transfer, each tendon

© Copyright 2026 American Medical Association. All rights reserved.

Common Language Description

The procedure described by CPT® Code 26510 refers to a surgical technique known as cross intrinsic transfer, which involves the manipulation of the tendons of the intrinsic muscles of the hand. The intrinsic muscles are those that are located entirely within the hand and are responsible for fine motor movements, including the coordination and control of the fingers. These muscles are categorized into four distinct groups: the thenar muscles, which control thumb movements; the hypothenar muscles, which manage movements of the small finger; the lumbricals, which assist in flexing the metacarpophalangeal joints while extending the interphalangeal joints; and the interossei, which are responsible for abduction and adduction of the fingers. The cross intrinsic transfer procedure specifically targets the interosseous muscles, which play a crucial role in finger stability and movement. This surgical intervention is primarily indicated for patients suffering from ulnar drift, a condition often associated with severe rheumatoid arthritis, where the fingers deviate towards the ulnar side of the hand. During the procedure, an incision is made on the finger to expose the interosseous muscle. The tendon on the ulnar side of the finger is carefully freed from its attachments, allowing the surgeon to reroute it across the web space to the radial side. This rerouting is essential for restoring proper alignment and function of the fingers. The tendon is then anchored to either the radial extensor hood or the radial collateral ligament of the adjacent finger, thereby providing enhanced radial stability. Each tendon transferred during this procedure is reported separately, reflecting the complexity and specificity of the surgical intervention.

© Copyright 2026 Coding Ahead. All rights reserved.

1. Indications

The cross intrinsic transfer procedure is indicated for the following conditions:

  • Ulnar Drift This condition is characterized by the lateral deviation of the fingers towards the ulnar side of the hand, often resulting from severe rheumatoid arthritis.

2. Procedure

The cross intrinsic transfer procedure involves several critical steps to ensure proper execution and patient outcomes.

  • Step 1: Incision The procedure begins with an incision made on the affected finger to provide access to the underlying structures. This incision is strategically placed to minimize damage to surrounding tissues while allowing adequate exposure of the interosseous muscles.
  • Step 2: Exposure of the Interosseous Muscle Once the incision is made, the surgeon carefully dissects through the layers of tissue to expose the interosseous muscle. This step is crucial as it allows the surgeon to visualize the tendon that needs to be manipulated.
  • Step 3: Freeing the Interosseous Tendon The interosseous tendon located on the ulnar side of the finger is identified and freed from its attachments to the central and lateral slips. This step is essential to allow for the rerouting of the tendon without tension or restriction.
  • Step 4: Rerouting the Tendon After the tendon is freed, it is rerouted across the adjacent web space. This rerouting is performed to reposition the tendon to provide better alignment and function of the finger.
  • Step 5: Attachment The rerouted interosseous tendon is then anchored to the radial extensor hood or secured to the radial collateral ligament of the adjacent finger. This anchoring is vital for restoring radial stability and improving the overall function of the hand.

3. Post-Procedure

Following the cross intrinsic transfer procedure, patients typically require a period of rehabilitation to regain strength and mobility in the affected fingers. Post-operative care may include immobilization of the finger to allow for proper healing of the tendon transfer. Patients are often advised to engage in physical therapy to facilitate recovery and improve hand function. Monitoring for any signs of complications, such as infection or improper healing, is also essential during the recovery phase. The expected recovery time may vary depending on the individual patient and the extent of the procedure performed.

Short Descr THUMB TENDON TRANSFER
Medium Descr CROSS INTRINSIC TRANSFER EACH TENDON
Long Descr Cross intrinsic transfer, each tendon
Status Code Active Code
Global Days 090 - Major Surgery
PC/TC Indicator (26, TC) 0 - Physician Service Code
Multiple Procedures (51) 2 - Standard payment adjustment rules for multiple procedures apply.
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 Hospital Part B services paid through a comprehensive APC
ASC Payment Indicator Surgical procedure on ASC list in CY 2007; payment based on OPPS relative payment weight.
Type of Service (TOS) 2 - Surgery
Berenson-Eggers TOS (BETOS) P5B - Ambulatory procedures - musculoskeletal
MUE 4
CCS Clinical Classification 160 - Other therapeutic procedures on muscles and tendons
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).
58 Staged or related procedure or service by the same physician or other qualified health care professional during the postoperative period: it may be necessary to indicate that the performance of a procedure or service during the postoperative period was: (a) planned or anticipated (staged); (b) more extensive than the original procedure; or (c) for therapy following a surgical procedure. this circumstance may be reported by adding modifier 58 to the staged or related procedure. note: for treatment of a problem that requires a return to the operating/procedure room (eg, unanticipated clinical condition), see modifier 78.
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.
76 Repeat procedure or service by same physician or other qualified health care professional: it may be necessary to indicate that a procedure or service was repeated by the same physician or other qualified health care professional subsequent to the original procedure or service. this circumstance may be reported by adding modifier 76 to the repeated procedure or service. note: this modifier should not be appended to an e/m service.
78 Unplanned return to the operating/procedure room by the same physician or other qualified health care professional following initial procedure for a related procedure during the postoperative period: it may be necessary to indicate that another procedure was performed during the postoperative period of the initial procedure (unplanned procedure following initial procedure). when this procedure is related to the first, and requires the use of an operating/procedure room, it may be reported by adding modifier 78 to the related procedure. (for repeat procedures, see modifier 76.)
79 Unrelated procedure or service by the same physician or other qualified health care professional during the postoperative period: the individual may need to indicate that the performance of a procedure or service during the postoperative period was unrelated to the original procedure. this circumstance may be reported by using modifier 79. (for repeat procedures on the same day, see modifier 76.)
80 Assistant surgeon: surgical assistant services may be identified by adding modifier 80 to the usual procedure number(s).
AS Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery
F1 Left hand, second digit
F2 Left hand, third digit
F3 Left hand, fourth digit
F4 Left hand, fifth digit
F6 Right hand, second digit
F7 Right hand, third digit
F8 Right hand, fourth digit
F9 Right hand, fifth digit
FA Left hand, thumb
GC This service has been performed in part by a resident under the direction of a teaching physician
LT Left side (used to identify procedures performed on the left side of the body)
RT Right side (used to identify procedures performed on the right side of the body)
SG Ambulatory surgical center (asc) facility service
XS Separate structure, a service that is distinct because it was performed on a separate organ/structure
Date
Action
Notes
2002-01-01 Changed Code description changed.
Pre-1990 Added Code added.
Code
Description
Code
Description
Code
Description
Code
Description
CasePilot

Get instant expert-level medical coding assistance.

Ask about:
CPT Codes Guidelines Modifiers Crosswalks NCCI Edits Compliance Medicare Coverage
Example: "What is CPT code 99213?" or "Guidelines for E/M services"