T63.064 vs T63.064A
T63.064 (Toxic effect of venom of other North and South American snake, undetermined) compared with T63.064A (Toxic effect of venom of other North and South American snake, undetermined, initial encounter), from the official CMS tabular data.
Summary
These codes represent different levels of the same hierarchy: T63.064 is the non-billable header that contains T63.064A, so only T63.064A (or a sibling) is reported.
Registry fact- What is different?
Title wording and billing status.T63.064A’s title adds “initial encounter” to the wording the two share (“Toxic effect of venom of other North and South American snake, undetermined”). T63.064 is a non-billable header; T63.064A is billable.
Registry fact
- Can these codes be reported together?
Not as a pair.T63.064 is the non-billable header that contains T63.064A. A header is not reported on a claim, so the choice is T63.064A 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. T63.064 carries 1 Excludes1 note and T63.064A 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. T63.064 carries 1 Excludes2 note and T63.064A carries 1 Excludes2 note covering other codes; the side-by-side table quotes them.
Official rule
- Is one more specific?
Yes.T63.064A is a subdivision of T63.064 in the tabular hierarchy, so it is the more specific of the two.
Registry fact
- Is one a parent or header code?
Yes.T63.064 is the non-billable header that contains T63.064A. 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 — T63.064 is not reportable. T63.064 is the non-billable category that contains T63.064A.
A header stands for the whole family of codes beneath it and is not reported on a claim, so the choice is T63.064A 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: T63.064 and T63.064A
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
| T63.064Toxic effect of venom of other North and South American snake, undetermined | T63.064AToxic effect of venom of other North and South American snake, undetermined, initial encounter | |
|---|---|---|
| Billing status | Non-billable header | 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 | Toxic effect of venom of other North and South American snake, undetermined is a non-billable ICD-10-CM category code (T63.064). | Toxic effect of venom of other North and South American snake, undetermined, initial encounter is a billable ICD-10-CM diagnosis code (T63.064A). |
| 7th character | The appropriate 7th character is to be added to each code from category T63 | The appropriate 7th character is to be added to each code from category T63 |
| Includes | bite or touch of venomous animal pricked or stuck by thorn or leaf | bite or touch of venomous animal pricked or stuck by thorn or leaf |
| Excludes1 | contact with and (suspected) exposure to toxic substances (Z77.-) | contact with and (suspected) exposure to toxic substances (Z77.-) |
| Excludes2 | ingestion of toxic animal or plant (T61.-, T62.-) | ingestion of toxic animal or plant (T61.-, T62.-) |
| Use additional code | code(s): for all associated manifestations of toxic effect, such as: respiratory conditions due to external agents (J60-J70) personal history of foreign body fully removed (Z87.821) | code(s): for all associated manifestations of toxic effect, such as: respiratory conditions due to external agents (J60-J70) personal history of foreign body fully removed (Z87.821) |
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