CPT Codes 98940, 98941, 98942: Complete Chiropractic Billing Guide

CPT codes 98940, 98941, and 98942 are the three codes that define chiropractic manipulative treatment (CMT) of the spine. Selecting the correct code on every claim determines your reimbursement, affects your audit risk profile, and reflects the accuracy of your clinical documentation.

This guide covers the definition of each code, how to select the right one based on spinal regions treated, Medicare reimbursement rates, modifier requirements, and the documentation that must support each claim.

The Three Chiropractic CMT Codes

CPT Code	Description	Spinal Regions	Medicare Rate (Approx.)
98940	Chiropractic manipulative treatment, spinal	1–2 regions	$28–$35
98941	Chiropractic manipulative treatment, spinal	3–4 regions	$48–$58
98942	Chiropractic manipulative treatment, spinal	5 regions	$62–$75

These codes are per-encounter — you bill one CMT code per patient visit, not one per region. The code selected should reflect the total number of spinal regions that received manipulation during the visit.

Defining the Five Spinal Regions

The AMA and CMS define five spinal regions for the purpose of CMT coding:

1. Cervical — C1 through C7 (including the occiput-atlas junction)
2. Thoracic — T1 through T12
3. Lumbar — L1 through L5
4. Sacral — Sacrum
5. Pelvic — Sacroiliac joints and pelvis

Manipulating multiple vertebral levels within the same region counts as one region. For example, adjusting C3, C5, and C7 is one cervical region — not three regions. Adjusting C5 and T4 is two regions (cervical + thoracic).

Code Selection: Getting It Right

When to Bill 98940

Bill 98940 when you manipulate 1 or 2 spinal regions during the visit. Common examples include a cervical-only adjustment or a lumbar + sacral adjustment. This is the appropriate code for focused, single-complaint visits.

When to Bill 98941

Bill 98941 when you manipulate 3 or 4 spinal regions. This is the most commonly billed chiropractic CMT code. A typical example: cervical + thoracic + lumbar adjustment. Your documentation must identify each region treated and the specific manipulation performed in each.

When to Bill 98942

Bill 98942 when you manipulate all 5 spinal regions in a single visit. This code is used infrequently — most patient visits do not involve all five regions. Billing 98942 regularly raises significant audit flags because it is difficult to clinically justify full-spine manipulation on a routine basis.

The AT Modifier

For Medicare claims, every CMT code must include the AT modifier (Active Treatment). This modifier certifies that the manipulation is part of an active corrective treatment plan — not maintenance care.

Without the AT modifier, Medicare will deny the claim automatically. With the AT modifier, you are making a compliance representation that the patient has a documented subluxation, an active treatment plan, and is demonstrating measurable improvement.

Documentation Requirements

Each CMT claim must be supported by visit documentation that includes:

• Chief complaint or reason for visit — why the patient is being seen today
• Subjective findings — patient-reported symptoms, pain levels, functional changes since last visit
• Objective findings — palpation results, range of motion measurements, orthopedic test findings, specific to each region treated
• Assessment — clinical interpretation tied to the subluxation diagnosis
• Plan — what was done (specific manipulation techniques, regions adjusted), frequency of continued treatment, and goals
• Regions treated — each spinal region manipulated must be specifically identified in the note

The documentation must support the code billed. If you bill 98941 (3-4 regions), your note must identify 3 or 4 specific regions and document findings in each. A note that says "full spine adjustment" without specifying regions does not support any specific code level.

Audit Risk by Code

Your billing pattern across these three codes is one of the first things auditors examine. Here is what draws scrutiny:

• High 98942 utilization — If more than 5–10% of your claims use 98942, expect questions. Full-spine manipulation on every visit is clinically unusual and suggests routine upcoding.
• Never billing 98940 — If you never bill the lowest code, auditors infer that you may be routinely upcoding. A normal practice sees a mix of all three codes.
• Identical code on every visit for the same patient — Treatment plans should evolve. If a patient receives 98941 on every visit for 6 months with no code variation, it suggests the documentation may be template-driven rather than individualized.

Commercial Payer Considerations

While Medicare pays only for spinal CMT codes 98940–98942, commercial payers often cover additional chiropractic codes including:

• 98943 — CMT, extraspinal, 1 or more regions (extremity manipulation)
• 97140 — Manual therapy (soft tissue mobilization)
• 97110 — Therapeutic exercise
• 97112 — Neuromuscular re-education

Coverage and authorization requirements vary by payer. Always verify the patient's specific plan before billing supplemental codes.

Bottom Line

Code selection is not a billing decision — it is a clinical documentation decision. The code must match the regions you actually manipulated, and your chart note must identify each region with supporting findings. When in doubt, code conservatively. A pattern of accurate, well-documented claims at the appropriate code level is the strongest protection against audit liability.