CPT Code 98942: When and How to Bill the Full Spine Adjustment

When Do You Bill CPT Code 98942?

CPT code 98942 is the spinal chiropractic manipulative treatment (CMT) code that reports a full spine adjustment covering all five spinal regions: cervical, thoracic, lumbar, sacral, and pelvic. You bill it only when every one of those five regions has a documented dysfunction you treated in a single visit. It carries the highest allowable of the spinal CMT codes, which is exactly why it draws the most payer scrutiny.

• What 98942 covers: It is the top tier of the spinal CMT family, one step above 98941 (3 to 4 regions), and reports treatment of all five spinal regions in one visit.
• What documentation auditors expect: Each region named individually with its own PART findings, a subluxation diagnosis from the M99.0x series, medical necessity for active care, and the AT modifier for Medicare.
• Why it draws audits: Because it is the highest-paid spinal CMT code, routine 98942 billing looks like upcoding, and chiropractic already has the highest improper payment rate in Medicare Part B.

CPT code 98942 sits at the top of the spinal CMT ladder. It reports a full spine adjustment across all five regions and carries the highest allowable of the spinal codes, so it also draws the most scrutiny. Billing all five regions stands out to payers, which is why 98942 is the code most often tied to upcoding reviews. Using it correctly comes down to one thing: your documentation has to justify every region. This guide explains when 98942 applies in 2026, what auditors look for, and how to keep these claims clean.

What Is CPT Code 98942?

CPT code 98942 describes chiropractic manipulative treatment of the spine involving all five spinal regions. The AMA CPT code set defines the spinal CMT family by region count, and 98942 is the step above 98941 (3 to 4 regions) and the highest of the three spinal codes. You report it only when you treated and documented a dysfunction in every one of the five spinal regions during a single visit.

The code is not difficult to apply. The discipline is in earning it. A 98942 claim is a statement that the full spine required care that day, and your note has to back that statement region by region. In our experience matching providers with billing partners, the practices that use 98942 cleanly treat it as the exception their documentation proves, not a habit that quietly becomes the default on a busy schedule.

The Five Spinal Regions You Must Document

For CMT coding, the spine is divided into five regions. Reporting 98942 means all five carried a documented dysfunction that you treated during the visit:

• Cervical region, including the atlanto-occipital joint.
• Thoracic region, including the costovertebral and costotransverse joints.
• Lumbar region.
• Sacral region.
• Pelvic region, including the sacroiliac joints.

If even one region lacks documented findings, the visit is a 98941, not a 98942. There is no rounding up. The difference between the two codes is the fifth region, and that region has to be supported in the record like any other. The most common issue we see providers run into is billing the fifth region off a vague note that never names it, which is exactly the gap an auditor looks for first.

98942 vs the Other CMT Codes

Seeing the family together makes the region-count rule concrete. The three spinal codes differ only by how many regions you treat, while 98943 covers extraspinal areas under separate rules. Approximate 2026 Medicare amounts below are national figures before the geographic practice cost index, based on the non-qualifying conversion factor of $33.4009.

Codes 98940 through 98942 are covered by Medicare only with the AT modifier, while 98943 is statutorily excluded and never paid by Medicare. For the base-tier code, see our guide to CPT 98940, and for the full family, our chiropractic CPT codes guide covers every code chiropractors bill daily.

Why 98942 Draws Audit Attention

Chiropractic carries the highest improper payment rate of any Medicare Part B service, and 98942 sits right in the center of that scrutiny. A CMS Comprehensive Error Rate Testing analysis put the chiropractic improper payment rate between 43.9 and 54.1 percent from 2010 to 2015, against 9.9 to 12.9 percent for other Part B services. An OIG audit of 2013 payments, reported in 2016, found that about 82 percent of the $438.1 million Medicare paid for chiropractic that year was unallowable, most of it maintenance care billed as active treatment.

Against that backdrop, a practice that reports 98942 on most visits looks like a practice that is upcoding, because it is uncommon for every patient to need all five regions treated at every encounter. OIG has specifically used average work relative value units to flag chiropractors whose 98942 usage looks high, so a routine full-spine rate is one of the clearest upcoding signals a practice can send. Providers often come to us after a Medicare records request on full-spine claims, and the fix is always the same: bill the code that matches the documented regions, and let 98942 be the exception the notes clearly support rather than the default.

What Documentation Do Auditors Expect for 98942?

Auditors expect your record to name all five spinal regions individually, each with its own findings, document subluxation in every region through the PART exam, establish medical necessity with active corrective care, pair the visit with the matching M99.0x subluxation diagnoses, and carry the AT modifier for Medicare. If a payer requests records, the note alone should make the five-region count obvious.

To stand behind a full spine claim, your record should establish each of the following:

• Name all five regions. Identify the cervical, thoracic, lumbar, sacral, and pelvic regions individually, each with its own findings, so the region count is unmistakable.
• Document subluxation in each region. Use the PART exam (Pain or tenderness, Asymmetry or misalignment, Range of motion abnormality, Tissue or tone changes), with at least two of the four present and one being asymmetry or range of motion.
• Show medical necessity. Establish active or corrective care with a reasonable expectation of improvement across the spine, since maintenance care does not meet the Medicare standard.
• Pair the right diagnoses. Support the visit with the M99.0x segmental and somatic dysfunction codes that match the regions treated: M99.01 cervical, M99.02 thoracic, M99.03 lumbar, M99.04 sacral, and M99.05 pelvic.
• Record a treatment plan. Document goals, expected frequency and duration, and measurable progress so repeated full-spine visits stay defensible.

Modifiers That Apply to 98942

The modifier rules for 98942 mirror the other spinal CMT codes:

• AT (Acute Treatment): Required by Medicare for active or corrective treatment of a subluxation. Without AT, Medicare treats the service as maintenance and denies it.
• GA: Use when you expect a denial and have a signed Advance Beneficiary Notice (ABN) on file, which applies to maintenance visits.
• GZ: Use when you expect a denial but do not have a signed ABN. It signals the service is not covered and is not billable to the patient.
• Modifier 25: Append to a separately identifiable evaluation and management service performed the same day, when that E/M is significant and beyond the work bundled into the adjustment.

One nuance worth watching: an OIG review found that almost all chiropractic claims carried the AT modifier regardless of whether the care was actually active, so the modifier alone does not protect a claim. The documentation behind it does.

How Medicare Covers and Pays 98942

Medicare covers manual manipulation of the spine to correct a subluxation, and 98942 qualifies when all five regions are supported and the AT modifier shows the care is active. An x-ray is no longer required to demonstrate a subluxation, since a physical exam documented with the PART criteria is sufficient. The extraspinal code 98943 remains statutorily excluded.

Payment runs through the Physician Fee Schedule formula, which multiplies the code’s relative value units by a geographic adjustment and the annual conversion factor. For 2026, the Medicare conversion factor is $33.4009 for providers not in a qualifying alternative payment model and $33.5675 for those who are, which puts 98942 near $47 nationally before locality adjustment. That figure is set to fall: the proposed 2027 conversion factor drops to $32.84, roughly 1.7 percent lower, trimming every CMT claim. Our breakdown of the 2027 chiropractic Medicare payment changes covers what is proposed and what to do before the September 14, 2026 comment deadline. Find your exact figure with the CMS Physician Fee Schedule Look-Up Tool filtered to your MAC locality; commercial and Medicaid rates follow your contracts.

Common 98942 Billing Mistakes

Across the billing companies we vet, the same full-spine mistakes surface again and again. Each one is preventable with a pre-submission check.

• Billing 98942 as a default. Reporting all five regions on most visits invites record requests, since it is uncommon for every patient to need full-spine care every time.
• Naming vertebral levels instead of regions. A note that lists segments but never names five regions gives the payer grounds to downcode to 98941.
• Leaning on the AT modifier alone. The modifier does not prove active care; the documented functional progress does.
• Repeating identical notes. Copy-forward notes that never change read as maintenance care, which Medicare does not cover.
• Using a pain code as primary. Medicare wants the M99.0x subluxation code as the primary diagnosis, with symptom codes secondary.
• Ignoring visit-count thresholds. OIG found that chiropractic services above 30 per beneficiary per year were all unallowable in its review, so high-frequency full-spine billing compounds the risk.

In-House vs Outsourced for 98942

A solo chiropractor with a low, well-documented full-spine rate may handle 98942 in-house. A higher-volume or multi-provider practice, where full-spine claims are frequent and payer scrutiny is constant, often finds that a specialized billing partner protects more revenue than it costs by keeping the region counting, the AT modifier, and the PART documentation defensible. This is the kind of exposure Tim Daniels, Director of Strategic Accounts at Billing Service Quotes, weighs when reviewing whether a practice’s chiropractic billing can hold up under an audit. If you are weighing that decision, compare your options through Chiropractor Billers before the next records request lands.

Frequently Asked Questions

Next Steps

• Billing fewer regions? See our guide to CPT 98940 for one-to-two-region manipulation.
• Need the full code set? Our chiropractic CPT codes guide covers the CMT family, E/M codes, and therapy modifiers.
• Planning for lower rates? Read the 2027 chiropractic Medicare payment changes before the comment deadline.
• Ready to keep your full-spine claims defensible? Get matched with a chiropractic billing partner that counts regions and documents subluxation the way auditors expect.