S13.120D — Subluxation of C1/C2 cervical vertebrae, subsequent encounter
Is S13.120D billable?
Yes — S13.120D is billable for FY2027. S13.120D is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. S13.120D may be submitted for encounters from October 1, 2026 through September 30, 2027.
S13.120D at a glance
| Code | S13.120D |
|---|---|
| Description | Subluxation of C1/C2 cervical vertebrae, subsequent encounter |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "D" | subsequent encounter |
What does the 7th character "D" mean in S13.120D?
In S13.120D, the 7th character D means subsequent encounter. The 7th character is required for S13.120D to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does S13.120D group to?
S13.120D 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 S13.120D listed in the Alphabetic Index?
The Alphabetic Index lists these routes under S13.120, the nearest indexed parent of S13.120D. Use them to find the family, then select the specific code.
- Subluxation › vertebral › traumatic › cervical › atlantoaxial joint
- Subluxation › vertebral › traumatic › cervical › joint between › C1 and C2
Use additional code — inherited from Chapter 19
Report an additional code alongside S13.120D to fully describe the condition. S13.120D 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 S13.120D, but a patient may have both at the same time. When documentation supports it, S13.120D and the excluded code may both be reported.
Excludes2 — not included here — inherited from S10-S19
The conditions below are not part of S13.120D, but a patient may have both at the same time. When documentation supports it, S13.120D and the excluded code may both be reported.
Excludes2 — not included here — inherited from S13
The conditions below are not part of S13.120D, but a patient may have both at the same time. When documentation supports it, S13.120D and the excluded code may both be reported.
- strain of muscle or tendon at neck level (S16.1)
Excludes2 — not included here — inherited from S13.1
The conditions below are not part of S13.120D, but a patient may have both at the same time. When documentation supports it, S13.120D and the excluded code may both be reported.
- fracture of cervical vertebrae (S12.0-S12.3-)
Code also — inherited from S13
Two codes may be needed to describe the condition fully. Whether S13.120D is sequenced first depends on the reason for the encounter.
- any associated open wound
Code also — inherited from S13.1
Two codes may be needed to describe the condition fully. Whether S13.120D is sequenced first depends on the reason for the encounter.
How long has S13.120D existed?
S13.120D 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.