X37.9XXD vs X37.9XXS
X37.9XXD (Unspecified cataclysmic storm, subsequent encounter) compared with X37.9XXS (Unspecified cataclysmic storm, sequela), from the official CMS tabular data.
Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources
Summary
No tabular note links these codes. Both belong to category X37, and nothing in the tabular list prevents reporting each when it is documented.
Registry fact- What is different?
Title wording.The titles share “Unspecified cataclysmic storm”; X37.9XXD says “subsequent encounter” where X37.9XXS says “sequela”.
Registry fact
Nothing found in 7 other checks
- Can these codes be reported together?
No instruction prevents it.No note in either entry names the other. Both belong to category X37; each may be reported when its own documentation is present.
Registry fact
- Is there an Excludes1 relationship?
None.Neither entry carries an Excludes1 note that names the other code. X37.9XXD carries 1 Excludes1 note and X37.9XXS carries 1 Excludes1 note covering other codes; the side-by-side table quotes them.
Official rule
- Is there an Excludes2 relationship?
None.Neither entry carries an Excludes2 note that names the other code.
Official rule
- Is one more specific?
No.Both titles are unspecified forms within category X37, and neither is a subdivision of the other.
Registry fact
- Is one a parent or header code?
No.Both are billable codes, and neither contains the other.
Registry fact
- Are there sequencing instructions?
None.Neither entry carries a Code First or Use Additional Code note that names the other.
Official rule
- Are there other coding relationships?
None found.No laterality, encounter-phase, Table of Neoplasms, Table of Drugs and Chemicals, or history-versus-active-disease relationship links these codes.
MedCoder-derived
Official rule: a tabular instructional note or a section of the ICD-10-CM Official Guidelines, quoted as published. Registry fact: the codes’ own published attributes (titles, billable status, position in the hierarchy, code set). MedCoder-derived: a reading MedCoder computes from those facts; it is not itself a rule. How to read the labels
Can these codes be reported together?
Yes, when each is documented. X37.9XXD and X37.9XXS both belong to category X37.
No Excludes1/Excludes2 relationship exists between these codes in the official tabular list. The code titles state what each one covers, and the documentation decides which applies.
Side by side
Similar descriptions do not make codes interchangeable. The documentation and the official instructions decide which code applies.
Unspecified cataclysmic storm, subsequent encounter
Unspecified cataclysmic storm, sequela
- collapse of dam or man-made structure causing earth movement (X36.0)
X37 Cataclysmic storm
V00-Y99 — External Causes of Morbidity (V00-Y99)
- Storm NOS
- The appropriate 7th character is to be added to each code from category X37
No Excludes2, Code first, Use additional code and Code also note at either code.
Notes are the code’s own tabular entry, quoted as published. A note that names the other code is the one the verdict above rests on. In a row that differs, each code’s own notes are listed under it, and the notes every code shares are listed once beneath them.
Derived from the official CMS ICD-10-CM tabular data (FY2027). A coding-rule comparison, not billing advice: payer-specific edits and medical-necessity policy are outside its scope. All data sources