T33.7 vs T33.70XD
T33.7 (Superficial frostbite of knee and lower leg) compared with T33.70XD (Superficial frostbite of unspecified knee and lower leg, subsequent encounter), from the official CMS tabular data.
Summary
These codes represent different levels of the same hierarchy: T33.7 is the non-billable header that contains T33.70XD, so only T33.70XD (or a sibling) is reported.
Registry fact- What is different?
Title wording and billing status.The titles share “Superficial frostbite of”; T33.7 says “knee and lower leg” where T33.70XD says “unspecified knee and lower leg, subsequent encounter”. T33.7 is a non-billable header; T33.70XD is billable.
Registry fact
- Can these codes be reported together?
Not as a pair.T33.7 is the non-billable header that contains T33.70XD. A header is not reported on a claim, so the choice is T33.70XD or a sibling that matches the documentation.
Registry fact
- Is there an Excludes1 relationship?
None.Neither entry carries an Excludes1 note that names the other code.
Official rule
- Is there an Excludes2 relationship?
None.Neither entry carries an Excludes2 note that names the other code. T33.7 carries 2 Excludes2 notes and T33.70XD carries 2 Excludes2 notes covering other codes; the side-by-side table quotes them.
Official rule
- Is one more specific?
Yes.T33.70XD is a subdivision of T33.7 in the tabular hierarchy, so it is the more specific of the two.
Registry fact
- Is one a parent or header code?
Yes.T33.7 is the non-billable header that contains T33.70XD. A header stands for the whole family beneath it and is not reported on a claim.
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?
Not as a pair — T33.7 is not reportable. T33.7 is the non-billable category that contains T33.70XD.
A header stands for the whole family of codes beneath it and is not reported on a claim, so the choice is T33.70XD or a sibling that matches the documentation. No Excludes1/Excludes2 relationship exists between these codes in the official tabular list.
Official guidance behind these answers
Section I.B.2 — Level of Detail in Coding · applies to: T33.7 and T33.70XD
Diagnosis codes are to be used and reported at their highest number of characters available and to the highest level of specificity documented in the medical record. ICD-10-CM diagnosis codes are composed of codes with 3, 4, 5, 6 or 7 characters. Codes with three characters are included in ICD-10-CM as the heading of a category of codes that may be further subdivided by the use of fourth and/or fifth characters and/or sixth characters, which provide greater detail. A three-character code is to be used only if it is not further subdivided. A code is invalid if it has not been coded to the full number of characters required for that code, including the 7th character, if applicable.
ICD-10-CM Official Guidelines FY2026
Quoted from the ICD-10-CM Official Guidelines for Coding and Reporting in effect for the release shown. The tabular notes above are the code-level instruction; these sections are the convention that says how such a note is applied. Source document (CMS PDF) · Release and checksum
Side by side
| T33.7Superficial frostbite of knee and lower leg | T33.70XDSuperficial frostbite of unspecified knee and lower leg, subsequent encounter | |
|---|---|---|
| Billing status | Non-billable header Report instead: T33.70XA, T33.70XD, T33.70XS, T33.71XA, T33.71XD | Billable |
| Classification | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) |
| Definition | Superficial frostbite of knee and lower leg is a non-billable ICD-10-CM category code (T33.7). | Superficial frostbite of unspecified knee and lower leg, subsequent encounter is a billable ICD-10-CM diagnosis code (T33.70XD). |
| 7th character | The appropriate 7th character is to be added to each code from category T33 | The appropriate 7th character is to be added to each code from category T33 |
| Includes | frostbite with partial thickness skin loss | frostbite with partial thickness skin loss |
| Excludes2 | superficial frostbite of ankle and foot (T33.8-) hypothermia and other effects of reduced temperature (T68, T69.-) | superficial frostbite of ankle and foot (T33.8-) hypothermia and other effects of reduced temperature (T68, T69.-) |
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.
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