ICDcodes.org
FY2027

S23.100D — Subluxation of unspecified thoracic vertebra, subsequent encounter

BillableUnspecified

Is S23.100D billable?

Yes, but S23.100D is an unspecified code. S23.100D is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, S23.100D is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting S23.100D — the more specific alternatives are listed below.

S23.100D at a glance

CodeS23.100D
DescriptionSubluxation of unspecified thoracic vertebra, subsequent encounter
BillableYes
Code setICD-10-CM FY2027
Valid for encountersOctober 1, 2026 – September 30, 2027
7th character "D"subsequent encounter

What does the 7th character "D" mean in S23.100D?

In S23.100D, the 7th character D means subsequent encounter. The 7th character is required for S23.100D to be a valid, complete code.

Same condition, different episode of care — switch the 7th character:

Which MS-DRGs does S23.100D group to?

S23.100D sits in MDC 23 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

  • 949Aftercare with CC/MCCmedical
  • 950Aftercare without CC/MCCmedical

How is S23.100D listed in the Alphabetic Index?

The Alphabetic Index lists these routes under S23.100, the nearest indexed parent of S23.100D. Use them to find the family, then select the specific code.

  • Subluxation › vertebral › traumatic › thoracic

Use additional code — inherited from Chapter 19

Report an additional code alongside S23.100D to fully describe the condition. S23.100D is sequenced first.

  • code to identify any retained foreign body, if applicable (Z18.-)

Excludes2 — not included here — inherited from Chapter 19

The conditions below are not part of S23.100D, but a patient may have both at the same time. When documentation supports it, S23.100D and the excluded code may both be reported.

  • birth trauma (P10-P15)
  • obstetric trauma (O70-O71)

Excludes2 — not included here — inherited from S20-S29

The conditions below are not part of S23.100D, but a patient may have both at the same time. When documentation supports it, S23.100D and the excluded code may both be reported.

  • burns and corrosions (T20-T32)
  • effects of foreign body in bronchus (T17.5)
  • effects of foreign body in esophagus (T18.1)
  • effects of foreign body in lung (T17.8)
  • effects of foreign body in trachea (T17.4)
  • frostbite (T33-T34)
  • injuries of axilla
  • injuries of clavicle
  • injuries of scapular region
  • injuries of shoulder
  • insect bite or sting, venomous (T63.4)

Excludes2 — not included here — inherited from S23

The conditions below are not part of S23.100D, but a patient may have both at the same time. When documentation supports it, S23.100D and the excluded code may both be reported.

  • dislocation, sprain of sternoclavicular joint (S43.2, S43.6)
  • strain of muscle or tendon of thorax (S29.01-)

Excludes2 — not included here — inherited from S23.1

The conditions below are not part of S23.100D, but a patient may have both at the same time. When documentation supports it, S23.100D and the excluded code may both be reported.

  • fracture of thoracic vertebrae (S22.0-)

Code also — inherited from S23

Two codes may be needed to describe the condition fully. Whether S23.100D is sequenced first depends on the reason for the encounter.

  • any associated open wound

Code also — inherited from S23.1

Two codes may be needed to describe the condition fully. Whether S23.100D is sequenced first depends on the reason for the encounter.

How long has S23.100D existed?

S23.100D has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.