W18.02 vs Z91.81
W18.02 (Striking against glass with subsequent fall) compared with Z91.81 (History of falling), 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 coding relationship between these codes was found in the tabular notes or in MedCoder’s derived relationships.
- What is different?
The conditions named, billing status and chapter.W18.02 is “Striking against glass with subsequent fall”; Z91.81 is “History of falling”. W18.02 is a non-billable header; Z91.81 is billable. W18.02 sits in V00-Y99 — External Causes of Morbidity (V00-Y99); Z91.81 in Z00-Z99 — Factors Influencing Health Status and Contact with Health Services (Z00-Z99).
Registry fact
- Is one a parent or header code?
One is a header.W18.02 is a non-billable header, but Z91.81 is not one of its subdivisions.
Registry fact
Nothing found in 5 other checks; 1 check does not apply
- Can these codes be reported together?
No instruction prevents it.No note in either entry names the other, and no derived relationship links them. Each may be reported when its own documentation requirements are met.
Registry fact
- Is there an Excludes1 relationship?
None.Neither entry carries an Excludes1 note that names the other code. W18.02 carries 6 Excludes1 notes 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. W18.02 carries 3 Excludes2 notes and Z91.81 carries 5 Excludes2 notes covering other codes; the side-by-side table quotes them.
Official rule
- Is one more specific?
Not comparable.The codes sit in different categories; specificity is only comparable within one category.
- 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.
No Excludes1/Excludes2 relationship exists between these codes in the official tabular list. Each may be reported when its own documentation requirements are met.
Side by side
Similar descriptions do not make codes interchangeable. The documentation and the official instructions decide which code applies.
Striking against glass with subsequent fall
History of falling
- fall on same level due to slipping, tripping, or stumbling with subsequent striking against object (W01.1-)
- assault involving a fall (Y01-Y02)
- fall from animal (V80.-)
- fall (in) (from) machinery (in operation) (W28-W31)
- fall (in) (from) transport vehicle (V01-V99)
- intentional self-harm involving a fall (X80-X81)
None at this code
- at risk for fall (history of fall) Z91.81
- fall (in) (from) burning building (X00.-)
- fall into fire (X00-X04, X08)
- contact with and (suspected) exposures hazardous to health (Z77.-)
- exposure to pollution and other problems related to physical environment (Z77.1-)
- female genital mutilation status (N90.81-)
- occupational exposure to risk factors (Z57.-)
- personal history of physical injury and trauma (Z87.81, Z87.82-)
None at this code
- any follow-up examination (Z08-Z09)
W18 Other slipping, tripping and stumbling and falls
Z91 Personal risk factors, not elsewhere classified
V00-Y99 — External Causes of Morbidity (V00-Y99)
Z00-Z99 — Factors Influencing Health Status and Contact with Health Services (Z00-Z99)
None at this code
- At risk for falling
- The appropriate 7th character is to be added to each code from category W18
None at this code
No Code first and Use additional code 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