Code Peripheral Nerve Procedures - Certified Professional Coder CPC

1. Which add-on CPT® code reports the second lumbar transforaminal epidural injection at an additional level?
   Answer: 64484 CPT® 64484 describes injection by transforaminal technique, each additional level, lumbar or sacral (add-on to 64483) — the correct add-on code for each additional lumbar or sacral transforaminal epidural injection performed beyond the first level in the same session. Code 64483 is the primary code for the first lumbar transforaminal epidural injection; only one unit of 64483 is reported regardless of the number of levels, with 64484 reported for each additional level. Code 64480 describes the cervical or thoracic transforaminal epidural additional level add-on (used with 64479); this is a lumbar procedure, requiring 64484. Code 64492 describes the third and additional paravertebral facet joint injection levels (add-on to 64490 cervical/thoracic); facet joint injections differ from transforaminal epidural injections. Code 64493 is the primary lumbar facet joint injection code, not an add-on.
2. Which CPT® code is reported for a single-level intercostal nerve block?
   Answer: 64420 CPT® 64420 describes injection of anesthetic agent, intercostal nerve, single level — the correct code for a single intercostal nerve block at one thoracic level. Code 64421 is the add-on code for each additional intercostal nerve level beyond the first; it cannot be reported as a standalone primary code. Code 64461 describes paravertebral block (thoracic, single injection) — a different technique targeting the paravertebral space where nerve roots emerge, not the intercostal nerve in the mid-thorax. Code 64625 is not a current standard intercostal nerve code. The intercostal nerve block series (64420 for single level, 64421 as add-on for each additional level) is distinct from the paravertebral block series (64461-64463).
3. Which add-on CPT® code is reported for the second digital nerve repair?
   Answer: 64832 CPT® 64832 describes suture of each additional digital nerve, hand or foot (add-on to 64831) — the correct add-on code for every digital nerve repaired beyond the first in the same operative session. When two digital nerves are repaired, the correct reporting is 64831 (first nerve) plus one unit of 64832 (second nerve). Code 64831 is the primary code for the first digital nerve and cannot be reported a second time for a subsequent repair in the same encounter; the add-on 64832 must be used for all additional digital nerve repairs. Code 64836 describes suture of the ulnar nerve trunk at the wrist — a major nerve repair, not a digital nerve repair. Code 64835 describes suture of the median nerve at the wrist. Add-on code 64832 has no maximum — if five digital nerves are repaired, 64831 is reported once and 64832 is reported four times.
4. Which CPT® code is reported for primary repair of the ulnar nerve at the wrist?
   Answer: 64836 CPT® 64836 describes suture of the ulnar nerve at the wrist — the correct code for primary microsurgical repair of the ulnar nerve lacerated at the wrist level. Code 64835 describes suture of the median nerve at the wrist (carpal tunnel); the ulnar nerve, not the median nerve, is repaired here. Code 64837 describes suture of the ulnar nerve at the elbow; this repair is performed at the wrist, not the elbow. Code 64831 describes suture of a digital nerve — much smaller caliber digital branch nerves of the fingers, not the main ulnar nerve trunk at the wrist. Ulnar nerve repairs at the wrist (64836) versus elbow (64837) are distinguished by the anatomic level of the laceration, and both must be differentiated from median nerve repair at the wrist (64835).
5. Which CPT® code is reported for chemodenervation of one extremity with 5 or more muscle groups?
   Answer: 64644 CPT® 64644 describes chemodenervation of one extremity, 5 or more muscle groups — the correct code when botulinum toxin or another chemodenervation agent is injected into five or more muscle groups within a single extremity during the same encounter. Code 64642 describes chemodenervation of one extremity, 1 to 4 muscle groups; since 6 groups are injected (exceeding 4), 64644 is required rather than 64642. Code 64643 is the add-on for each additional extremity with 1-4 muscle groups (reported alongside 64642 or 64644 for a second extremity). Code 64645 is the add-on for each additional extremity with 5 or more muscle groups. The 1-4 versus 5-or-more muscle group threshold is the primary differentiator between 64642 and 64644.
6. Which add-on CPT® code reports the second lumbar facet nerve ablation level in the same session?
   Answer: 64636 CPT® 64636 describes destruction by neurolytic agent, paravertebral facet joint nerve, lumbar or sacral, each additional level (add-on to 64635) — the correct add-on code for each additional lumbar or sacral medial branch neurotomy (RFA) level performed beyond the first during the same session. Code 64635 is the primary code for the first lumbar facet nerve ablation level; the add-on code 64636 must be used for all additional levels rather than reporting 64635 again. Code 64633 describes cervical or thoracic facet nerve ablation, single level — this is a lumbar procedure. Code 64493 describes lumbar facet joint injection (diagnostic/therapeutic steroid), not radiofrequency ablation (destruction). The correct pairing is 64635 (first level) + 64636 for each additional level, paralleling the cervical structure of 64633 (first) + 64634 (add-on).
7. Which CPT® code is reported for this open carpal tunnel release?
   Answer: 64721 CPT® 64721 describes neuroplasty and/or transposition of the median nerve at the carpal tunnel — the correct code for open carpal tunnel release performed through a palmar incision with direct visualization and division of the transverse carpal ligament. Code 29848 describes endoscopic wrist surgery with release of the transverse carpal ligament (endoscopic carpal tunnel release), which uses a camera and specialized instruments through a smaller incision; since open technique is used here, 64721 is correct. Code 64719 describes neuroplasty and/or transposition of the ulnar nerve at the wrist (Guyon canal decompression); the median nerve, not the ulnar nerve, is treated here. Code 64718 describes neuroplasty and/or transposition of the ulnar nerve at the elbow (cubital tunnel decompression) — a different nerve and different anatomic location.
8. Which CPT® code is reported for insertion of the peripheral neurostimulator pulse generator?
   Answer: 64590 CPT® 64590 describes insertion or replacement of a peripheral or gastric neurostimulator pulse generator or transmitter — the correct code for implanting the power source (generator or transmitter) component of a peripheral nerve stimulator system, separate from electrode implantation. The electrode was already placed; this encounter is solely for generator insertion. Code 64595 describes revision or removal of a peripheral or gastric neurostimulator pulse generator or transmitter — a maintenance/removal procedure, not initial insertion. Code 64555 describes percutaneous implantation of a peripheral nerve stimulator electrode array — the electrode procedure, not the generator insertion. Code 64575 describes open implantation of a peripheral nerve electrode array. The electrode and generator components of neurostimulator systems are reported with separate codes: 64553/64555/64575 for electrodes and 64590 for the generator.
9. Which CPT® code is reported for this multiple-strand (cable) nerve graft of the arm exceeding 4 cm?
   Answer: 64898 CPT® 64898 describes nerve graft, multiple strands (cable), arm or leg, more than 4 cm in length — the correct code when a cable graft (two or more nerve strands placed in parallel) is used to bridge a nerve defect in the arm or leg and the graft exceeds 4 cm. Cable grafts are used for larger-caliber nerve repairs requiring multiple strands to match the recipient nerve cross-section. Code 64897 describes multiple-strand (cable) graft in the arm or leg, up to 4 cm; the graft here exceeds 4 cm, requiring 64898. Code 64893 describes a single-strand nerve graft in the arm or leg, more than 4 cm; a cable (multi-strand) graft is used here. Code 64891 describes a single-strand nerve graft in the hand or foot, more than 4 cm — incorrect on both strand count (single vs. cable) and anatomic location (hand/foot vs. arm). The graft type (single vs. cable strand), anatomic region (hand/foot vs. arm/leg), and length (up to 4 cm vs. more than 4 cm) are the three coding axes.
10. Which CPT® code is reported for open implantation of a peripheral nerve electrode array (non-sacral)?
    Answer: 64575 CPT® 64575 describes open implantation of a neurostimulator electrode array at a peripheral nerve (excluding sacral nerve) — the correct code for surgically implanting a stimulator electrode directly onto or around a named peripheral nerve through an open incision. Code 64561 describes percutaneous implantation of a sacral nerve electrode; this is a non-sacral peripheral nerve implanted via open approach, excluding both characteristics. Code 64555 describes percutaneous implantation of a peripheral nerve electrode (non-sacral); the approach here is open (surgical incision), not percutaneous. Code 64580 describes open implantation of a sacral nerve electrode array; the peripheral nerve target here is not the sacral nerve. The approach (percutaneous vs. open) and target nerve (peripheral non-sacral vs. sacral) create four codes: 64555, 64561, 64575, and 64580.
11. Which CPT® code is reported for percutaneous implantation of a sacral nerve stimulator electrode?
    Answer: 64561 CPT® 64561 describes percutaneous implantation of a neurostimulator electrode array at the sacral nerve — the correct code for fluoroscopically guided placement of a trial or permanent sacral neuromodulation electrode through the sacral foramen without open surgery. Code 64555 describes percutaneous implantation of a neurostimulator electrode array at a peripheral nerve (excluding sacral nerve); sacral nerve stimulation has its own dedicated code (64561). Code 64580 describes open implantation of a sacral nerve electrode array using a surgical incision; the technique here is percutaneous, not open. Code 64575 describes open implantation of a peripheral nerve (excluding sacral) electrode array. The sacral nerve and peripheral nerve (non-sacral) stimulator codes form parallel pairs: percutaneous (64555/64561) and open (64575/64580).
12. Which CPT® code is reported for this brachial plexus nerve block (single injection)?
    Answer: 64415 CPT® 64415 describes injection of anesthetic agent into the brachial plexus — the correct code for any single-injection brachial plexus block (interscalene, supraclavicular, infraclavicular, or axillary approach) providing anesthesia for upper extremity surgery. Code 64417 describes injection into the axillary nerve specifically — a single branch of the brachial plexus, not the entire plexus trunk; an axillary nerve block is distinct from a brachial plexus block. Code 64418 describes injection into the suprascapular nerve — a shoulder joint nerve, not the brachial plexus trunk. Code 64400 describes injection into the second or third division of the trigeminal nerve (facial region), unrelated to upper extremity regional anesthesia. The brachial plexus block (64415) covers the entire plexus approach, while individual terminal branch codes (64417/64418) apply to single-branch blocks.
13. Which CPT® code is reported for the greater occipital nerve block?
    Answer: 64405 CPT® 64405 describes injection of anesthetic agent into the greater occipital nerve — the correct code for a targeted greater occipital nerve block used to treat occipital neuralgia, cluster headache, and cervicogenic headache. Code 64400 describes injection into the second or third division of the trigeminal nerve (V2/V3), which innervates the face — not the occipital scalp. Code 64450 describes injection into other peripheral nerve or branch (not otherwise specified); when a specific named code exists (64405 for greater occipital nerve), the specific code takes precedence over the nonspecific 64450. Code 64418 describes injection into the suprascapular nerve, which is a shoulder joint nerve. When bilateral greater occipital nerve blocks are performed, 64405 is reported twice.
14. Which CPT® code is reported for this endoscopic carpal tunnel release?
    Answer: 29848 CPT® 29848 describes endoscopy of the wrist, surgical, with release of the transverse carpal ligament — the correct code for endoscopic (not open) carpal tunnel release performed with a camera and specialized cutting instrument through a small wrist incision. Code 64721 describes open carpal tunnel release through a palmar incision; the approach here is endoscopic, making 29848 the appropriate code. Code 64719 describes neuroplasty of the ulnar nerve at the wrist — a different nerve (ulnar, not median) and a different procedure. Code 64726 describes neuroplasty of the plantar digital nerve in the foot — an entirely different anatomic location and nerve. The distinction between open (64721) and endoscopic (29848) carpal tunnel release rests solely on the surgical technique.
15. Which CPT® code is reported for primary repair of the median nerve at the wrist?
    Answer: 64835 CPT® 64835 describes suture of the median nerve at the carpal tunnel (wrist) level — the correct code for primary microsurgical repair of a lacerated median nerve at the wrist. Code 64836 describes suture of the ulnar nerve at the wrist; the median nerve, not the ulnar nerve, is repaired here. Code 64831 describes suture of a digital nerve (proper or common digital branch); the median nerve trunk at the wrist is a major nerve, not a digital nerve. Code 64840 describes suture of the posterior tibial nerve in the leg — a lower extremity nerve, entirely different anatomy. Correct identification of the specific nerve (median vs. ulnar) and the anatomic level (wrist vs. elbow) determines the appropriate nerve suture code.
16. Which CPT® code is reported for this single-level lumbar facet nerve radiofrequency ablation?
    Answer: 64635 CPT® 64635 describes destruction by neurolytic agent (including radiofrequency ablation) of a paravertebral facet joint nerve in the lumbar or sacral region, single level — the correct code for medial branch neurotomy (RFA) targeting lumbar facet joint innervation at one level. Code 64633 describes destruction of a paravertebral facet joint nerve in the cervical or thoracic region, single level; this is a lumbar procedure. Code 64636 is the add-on code for a second (and each additional) lumbar or sacral facet nerve level beyond the first; only one level is treated here. Code 64493 describes injection (not destruction) into a lumbar paravertebral facet joint; RFA is a destructive procedure requiring 64635, not an injection code.
17. Which CPT® code is reported for the suprascapular nerve block?
    Answer: 64418 CPT® 64418 describes injection of anesthetic agent into the suprascapular nerve — the correct code for a suprascapular nerve block performed to treat shoulder pain conditions including adhesive capsulitis, rotator cuff disease, and chronic glenohumeral arthritis. Code 64415 describes injection into the brachial plexus — a more proximal block targeting the entire plexus trunk, not a single branch. Code 64450 describes injection into other peripheral nerve or branch not otherwise specified; a specific named code (64418) exists for the suprascapular nerve and takes precedence over the nonspecific 64450. Code 64417 describes injection into the axillary nerve — a different branch of the brachial plexus supplying the deltoid muscle and lateral shoulder skin, distinct from the suprascapular nerve which supplies the supraspinatus, infraspinatus, and joint capsule.
18. Which CPT® code is reported for this single-level cervical facet nerve radiofrequency ablation?
    Answer: 64633 CPT® 64633 describes destruction by neurolytic agent (including radiofrequency ablation) of a paravertebral facet joint nerve in the cervical or thoracic region, single level — the correct code for cervical medial branch neurotomy (RFA) at one level. Code 64635 describes lumbar or sacral facet nerve destruction; this is a cervical procedure, requiring the cervical/thoracic code (64633). Code 64636 is the add-on for each additional lumbar or sacral facet nerve level — not applicable here (lumbar level, and only one level treated). Code 64634 is the add-on for each additional cervical or thoracic facet nerve level beyond the first (paired with 64633); only one level is treated here, so the add-on 64634 is not reported. Cervical/thoracic (64633 + 64634 for additional levels) and lumbar/sacral (64635 + 64636 for additional levels) form distinct pairs.
19. Which CPT® code is reported for this single-strand nerve graft of the arm, up to 4 cm?
    Answer: 64892 CPT® 64892 describes nerve graft, single strand, arm or leg, up to 4 cm — the correct code for a single-strand autograft harvested to bridge a nerve defect in the arm or leg when the graft is 4 cm or less in length. Code 64893 describes a single-strand nerve graft in the arm or leg, more than 4 cm; the graft length is within the 4 cm threshold, excluding 64893. Code 64897 describes a multiple-strand (cable) nerve graft in the arm or leg, up to 4 cm; only a single strand is used here. Code 64891 describes a single-strand nerve graft in the hand or foot, more than 4 cm — wrong on both anatomic region (hand vs. arm) and length threshold. The graft type (single vs. cable strand), anatomic region (hand/foot vs. arm/leg), and length (up to 4 cm vs. more than 4 cm) are the three coding axes.
20. Which CPT® code is reported for injection of the genicular nerve branches with imaging guidance?
    Answer: 64454 CPT® 64454 describes injection of anesthetic agent, genicular nerve branches, including imaging guidance — the correct code for injection of all required genicular nerve branches innervating the knee joint (superolateral, superomedial, and inferomedial) as a single reportable service that includes the associated imaging guidance. Code 64493 describes paravertebral facet joint injection in the lumbar or sacral region — a spinal procedure, not a knee nerve injection. Code 64450 describes injection into other peripheral nerve or branch not otherwise specified; 64454 is a specific named code for genicular nerve injection and takes precedence over 64450. Code 64483 describes transforaminal epidural injection in the lumbar or sacral region — a spinal epidural technique unrelated to peripheral knee nerve injection. CPT® 64454 bundles all three required genicular branch injections and the imaging guidance into a single code.

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