CPT code 64418 – Suprascapular nerve injection

Key takeaways

CPT code 64418 covers a single injection of anesthetic into the suprascapular nerve, not the axillary nerve (64417) or another peripheral nerve (64450).

Laterality, the anesthetic agent used, the clinical indication, and any imaging guidance must all appear in the procedure note to pass payer review.

Ultrasound guidance (76942) is separately reportable alongside 64418 when imaging is used and a contemporaneous report is documented.

Neurolytic destruction is reported with 64640 and fascial plane blocks usually with unlisted 64999, never with 64418.

Pabau’s claims management software submits and tracks CPT 64418 claims electronically through its Claim.MD integration.

CPT code 64418: Official descriptor and clinical overview

CPT code 64418 is defined by the American Medical Association as: Injection, anesthetic agent; suprascapular nerve.

The suprascapular nerve originates from the upper trunk of the brachial plexus (C5-C6). It supplies sensory and motor innervation to the shoulder joint, supraspinatus, and infraspinatus muscles. Blocking it relieves pain across a large portion of the glenohumeral joint without systemic analgesic load.

The code is used in pain management, anesthesiology, orthopedic surgery, and sports medicine settings. Typical scenarios include perioperative shoulder analgesia and chronic rotator cuff pain that has not responded to conservative care. Adhesive capsulitis is another, once corticosteroid injection has failed to give adequate relief.

What CPT 64418 covers and what it excludes

CPT 64418 covers a single-injection block of the suprascapular nerve with an anesthetic agent, either a local anesthetic alone or one combined with a corticosteroid. Neurolytic injection is a separate procedure, reported under 64640 rather than 64418. The injection technique, the physician’s professional work, and normal pre- and post-injection monitoring are all bundled into the base code.

Several related services are explicitly not included. Understanding what 64418 excludes prevents both undercoding and unbundling errors.

• Included: Single injection of anesthetic agent into the suprascapular nerve; physician work of positioning, needle placement, and injection
• Not included: Imaging guidance (76942 for ultrasound, 77002 for fluoroscopy) reported separately when documented
• Not included: Bilateral performance; use modifier 50 or LT/RT per payer policy (see modifier section)
• Not included: Infusion catheter placement or continuous nerve block, which takes a separate catheter code
• Not included: Fascial plane blocks (e.g., PECS I/II, serratus anterior), which have no dedicated CPT code (usually unlisted 64999)
• Not included: Evaluation and management services on the same date unless a separately identifiable E/M is documented with modifier 25

The panel below sorts each common scenario by whether it adds a code to 64418 or replaces 64418 altogether.

Procedure note templates that capture these distinctions at the point of documentation keep the billed code matched to the injection the physician performed.

How the procedure is performed and documentation requirements for CPT code 64418

Incomplete documentation is a leading cause of 64418 denials. The procedure note must contain each of the following elements for the claim to survive payer review. Knowing the injection technique helps coders catch an incomplete note before submission.

Technique: The suprascapular nerve is targeted at the suprascapular notch or, increasingly, under real-time ultrasound guidance at the spinoglenoid notch. The physician positions the patient seated or prone and identifies the posterior shoulder anatomy. The needle is then advanced to the nerve, its position confirmed by landmark or image, and the anesthetic injected.

The whole procedure typically takes under ten minutes.

Documentation checklist for a payable 64418 claim:

1. Laterality: State “left suprascapular nerve,” “right suprascapular nerve,” or “bilateral” explicitly. Missing laterality is a frequent denial trigger.
2. Clinical indication / medical necessity: Name the diagnosis that justifies the injection (e.g., right shoulder pain secondary to rotator cuff tendinopathy, adhesive capsulitis, post-operative analgesia). The ICD-10 code on the claim must match the diagnosis documented in the note.
3. Anesthetic agent and volume: Name the drug, concentration, and volume injected (e.g., 10 mL of 0.25% bupivacaine).
4. Needle approach and confirmation: Describe the insertion site and confirm nerve localization, whether by anatomical landmark or imaging guidance. If imaging was used, the guidance must be documented in a contemporaneous report to support a separate imaging charge.
5. Patient response and post-procedure status: Brief note on pain relief or immediate outcome. Some MACs require this for medical necessity review.

Procedure note templates built around these five elements produce a clean claim from the first submission. Getting the note right at the point of care costs far less than chasing an appeal after a denial.

CPT code 64418 vs. 64417 and neighboring nerve block codes

The nerve block code family includes several adjacent codes that coders frequently confuse with CPT code 64418. The usual mix-ups are 64417, which targets the axillary nerve, and 64450, the code for other peripheral nerves. All three describe single-injection peripheral nerve blocks, so selecting the wrong anatomical target is an audit risk.

Can 64417 and 64418 be billed together? Both codes cover anatomically distinct nerves serving different shoulder regions: 64417 targets the axillary nerve (deltoid/teres minor), while 64418 targets the suprascapular nerve (supraspinatus/infraspinatus). When a clinician performs both injections at the same session, billing both codes may be appropriate.

Verify against current AMA CPT Assistant guidance and your MAC’s local coverage determination before routinely reporting them together, as payer edits vary.

Imaging guidance codes to report alongside CPT 64418

Ultrasound guidance is increasingly standard for suprascapular nerve blocks because it improves needle visualization and reduces the risk of pneumothorax.

When imaging is used, it is separately reportable, but only when specific conditions are met. Getting this wrong is an audit risk in both directions. Some coders under-report guidance they are entitled to, while others report it without the required documentation.

Three conditions must all be true to report 76942 with 64418:

• Real-time imaging was used during needle placement (not simply available in the room)
• Permanent images were recorded and archived as part of the medical record
• A separate imaging interpretation report was generated and signed by the performing or interpreting physician

If any of these three elements is missing, 76942 is not separately billable. Some Medicare Administrative Contractors bundle 76942 into the base 64418 reimbursement regardless; check your MAC’s current LCD before submitting.

CPT code 64418 billing: Modifier usage and bilateral claims

Modifier selection is where many 64418 billing errors occur. The wrong modifier can trigger a denial, a reduced payment, or a request for additional documentation. The table below covers the modifiers most relevant to this code.

Bilateral billing: Modifier 50 applicability for 64418 is payer-specific. Medicare generally allows bilateral reporting but payment methodology (single line item vs. two line items) varies by MAC. Always verify against the current Medicare Physician Fee Schedule bilateral surgery indicator and your MAC’s billing requirements before submitting a bilateral claim.

CPT code 64418 reimbursement: Medicare rates and RVU values

Medicare reimbursement for CPT code 64418 is set annually through the Medicare Physician Fee Schedule. Rates vary by locality through the Geographic Practice Cost Index (GPCI), by facility vs. non-facility setting, and by that year’s conversion factor.

The figures below are 2026 national figures, before GPCI adjustment. Verify them for your MAC locality using the CMS Physician Fee Schedule lookup tool or the FastRVU 2026 RVU calculator.

The zero global period means the same code can be billed on subsequent visits without a global period bundling issue. The payment amounts above are national figures before GPCI adjustment, so your locality payment will differ. Use the current-year fee schedule for precise figures.

Prior authorization requirements for CPT code 64418

Prior authorization requirements for 64418 vary significantly by payer and plan. Medicare does not require prior authorization for most suprascapular nerve block procedures, but commercial insurers, Medicare Advantage plans, and Medicaid managed care organizations commonly do. Never assume a universal rule applies.

When prior auth is required, the following documentation supports the authorization request:

• Diagnosis with supporting ICD-10-CM code (see the ICD-10 pairing section below)
• Clinical notes documenting failed conservative treatment (physical therapy, NSAIDs, oral analgesics) over an appropriate period, typically 4-6 weeks depending on the payer’s LCD
• Physician attestation of medical necessity, including functional impairment and pain scores
• Ordering physician specialty and credentials, as some payers restrict coverage to pain management specialists or orthopedic surgeons
• Proposed setting (office vs. ambulatory surgery center) which may affect coverage determination

Confirm insurance eligibility verification before the appointment date and check whether the patient’s specific plan benefit requires auth. Local Coverage Determinations issued by Medicare Administrative Contractors define the medical necessity criteria for nerve block procedures in your region. They also govern when Medicare Advantage plans model their own policies on federal LCD language.

Common denial reasons for CPT code 64418 and how to appeal

CPT code 64418 denials cluster around five root causes. Each has a specific corrective action and an appeal pathway that works when documentation is in order.

• Missing or insufficient medical necessity documentation: The payer’s LCD criteria were not met in the submitted note. Appeal with a detailed clinical summary, the treating physician’s attestation, and any supporting diagnostic imaging (MRI, ultrasound) showing the underlying pathology. Reference the specific LCD language your documentation satisfies.
• Missing prior authorization: The claim was submitted without an auth number when the payer required one. If auth was obtained verbally but the reference number was not on the claim, resubmit with the auth number. If auth was not obtained, appeal with documentation showing the clinical urgency or payer error.
• Incorrect modifier: Modifier 50 submitted where the payer requires two separate line items with LT and RT, or vice versa. Correct on resubmission; most payers accept a corrected claim within 90-180 days.
• Imaging guidance bundled incorrectly: 76942 was reported without a separate imaging report or without archived images. Remove 76942 if the documentation requirement was not met, or supplement the medical record with the imaging report and resubmit.
• Duplicate claim: A prior claim for the same service and date is already on file, often a facility claim submitted by the ASC or hospital. Coordinate with the facility to identify which provider is the billing entity, then resubmit with corrected claim type.

Structured denial management workflows catch these patterns before they age into write-offs. Tracking denial codes by root cause, not just by payer, shows whether the fix lies in documentation, workflow, or a payer contract.

ICD-10 diagnosis codes commonly paired with CPT code 64418

The ICD-10-CM codes on a 64418 claim must reflect documented clinical findings. Payers cross-reference the diagnosis code against their LCD’s covered-condition list to validate medical necessity. The following codes are most commonly linked to suprascapular nerve block procedures based on the clinical indications the procedure addresses.

Cross-reference each diagnosis code against your payer’s covered-condition list before submitting, using the LCD or the AAPC’s code lookup tools. Laterality in the ICD-10 code must match laterality in the CPT modifier and in the procedure note. A right-shoulder injection billed with a left-shoulder ICD-10 code will trigger a clinical edit every time.

How claims management software keeps 64418 claims clean

The denials in this guide start in the paperwork. Typical examples are a missing LT or RT, a 76942 line without its report, and a diagnosis coded to the wrong side. Checked by hand, those errors tend to surface weeks later on the remittance.

Pabau, the practice management and billing platform we build, includes error-checking claims management software with a Claim.MD integration. Claim.MD connects your practice to thousands of US payers for eligibility checks, electronic claim submission, and claim tracking.

Because the claim is built from the patient record, the laterality, diagnosis, and imaging details your clinician documented travel with it. Your team corrects a flagged claim once, before submission, instead of working the same error through an appeal.

Automate your nerve block claim workflow

Pabau connects to thousands of US payers through Claim.MD, so your CPT code 64418 claims are submitted electronically and tracked from submission to payment.

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Conclusion

Whether a 64418 claim pays is mostly settled before the injection, by the note template. A template that requires laterality, the agent, and the imaging report protects every claim that follows it. One that leaves them to memory produces the denials in this guide.

Start there, then confirm your MAC’s bilateral and imaging rules once rather than claim by claim. The set-up takes an afternoon, and the rework it saves repeats with every shoulder block you bill. Book a demo to see how Pabau carries a documented nerve block from the note to a paid claim.

Continue your research

Need a clearinghouse that handles nerve block claims? How Claim.MD clearinghouse works explains the electronic claims workflow from submission through ERA remittance.

Seeing a pattern of claim rejections? Revenue cycle management fundamentals covers the end-to-end billing process and where nerve block claims most often break down.

Billing a new payer for nerve blocks? Getting credentialed with insurance companies walks through the credentialing steps that unlock payer acceptance for nerve block procedures.

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