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B08.011 vs T88.1XXD

B08.011 (Vaccinia not from vaccine) compared with T88.1XXD (Other complications following immunization, not elsewhere classified, subsequent encounter), from the official CMS tabular data.

Summary

These codes should not be reported together because B08.011’s tabular entry lists T88.1XXD under Excludes1.

Official rule
What is different?

The conditions named and chapter.B08.011 is “Vaccinia not from vaccine”; T88.1XXD is “Other complications following immunization, not elsewhere classified, subsequent encounter”. B08.011 sits in A00-B99 — Certain Infectious and Parasitic Diseases (A00-B99); T88.1XXD in S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88).

Registry fact

Can these codes be reported together?

No.B08.011’s entry carries an Excludes1 note covering T88.1XXD: “vaccinia (from vaccination) (generalized) (T88.1)”. Both may be reported only when the documentation shows the two conditions are unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Official ruleGuide: Excludes1 vs Excludes2

Is there an Excludes1 relationship?

Yes.B08.011’s tabular entry: “vaccinia (from vaccination) (generalized) (T88.1)”. The note covers T88.1XXD.

Official ruleGuide: Excludes1 vs Excludes2

Is there an Excludes2 relationship?

None.Neither entry carries an Excludes2 note that names the other code. B08.011 carries 1 Excludes2 note and T88.1XXD carries 36 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.

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?

Conflict

Excludes1 conflict

B08.011
Vaccinia not from vaccine
↔
T88.1XXD
Other complications following immunization, not elsewhere classified, subsequent encounter

What we found

No — do not report together.B08.011 carries an Excludes1 note covering T88.1XXD: “vaccinia (from vaccination) (generalized) (T88.1)”

Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

What to review

Report one of the two. Both may be reported only when the documentation shows the two conditions are unrelated to each other.

Guide: Excludes1 vs Excludes2Check these on a claim

Why it matters

An Excludes1 note means the two conditions cannot occur together, so the pair should not be reported for the same encounter. The sole exception is when the conditions are documented as unrelated to each other.

Source / rule

CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a

Official guidance behind these answers

  • Section I.A.12.a — Excludes1 · applies to: Excludes1

    A type 1 Excludes note is a pure excludes note. It means “NOT CODED HERE!” An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition. An exception to the Excludes1 definition is the circumstance when the two conditions are unrelated to each other. If it is not clear whether the two conditions involving an Excludes1 note are related or not, query the provider. For example, code F45.8, Other somatoform disorders, has an Excludes1 note for "sleep related teeth grinding (G47.63)," because "teeth grinding" is an inclusion term under F45.8. Only one of these two codes should be assigned for teeth grinding. However psychogenic dysmenorrhea is also an inclusion term under F45.8, and a patient could have both this condition and sleep related teeth grinding. In this case, the two conditions are clearly unrelated to each other, and so it would be appropriate to report F45.8 and G47.63 together.

    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

B08.011Vaccinia not from vaccineT88.1XXDOther complications following immunization, not elsewhere classified, subsequent encounter
Billing statusBillableBillable
ClassificationA00-B99 — Certain Infectious and Parasitic Diseases (A00-B99)S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)
DefinitionVaccinia not from vaccine is a billable ICD-10-CM diagnosis code (B08.011).Other complications following immunization, not elsewhere classified, subsequent encounter is a billable ICD-10-CM diagnosis code (T88.1XXD).
7th character—The appropriate 7th character is to be added to each code from category T88
Includes—
Generalized vaccinia
Rash following immunization
Excludes1
vaccinia (from vaccination) (generalized) (T88.1)
vesicular stomatitis virus disease (A93.8)
vaccinia not from vaccine (B08.011)
Excludes2
monkeypox (B04)
anaphylactic shock due to serum (T80.5-)
other serum reactions (T80.6-)
postimmunization arthropathy (M02.2)
postimmunization encephalitis (G04.02)
postimmunization fever (R50.83)
complication following infusion, transfusion and therapeutic injection (T80.-)
complication following procedure NEC (T81.-)
complications of anesthesia in labor and delivery (O74.-)
complications of anesthesia in pregnancy (O29.-)
complications of anesthesia in puerperium (O89.-)
complications of devices, implants and grafts (T82-T85)
complications of obstetric surgery and procedure (O75.4)
dermatitis due to drugs and medicaments (L23.3, L24.4, L25.1, L27.0-L27.1)
poisoning and toxic effects of drugs and chemicals (T36-T65 with fifth or sixth character 1-4)
specified complications classified elsewhere
any encounters with medical care for postprocedural conditions in which no complications are present, such as:
artificial opening status (Z93.-)
closure of external stoma (Z43.-)
fitting and adjustment of external prosthetic device (Z44.-)
burns and corrosions from local applications and irradiation (T20-T32)
complications of surgical procedures during pregnancy, childbirth and the puerperium (O00-O9A)
mechanical complication of respirator [ventilator] (J95.850)
poisoning and toxic effects of drugs and chemicals (T36-T65 with fifth or sixth character 1-4 or 6)
postprocedural fever (R50.82)
specified complications classified elsewhere, such as:
cerebrospinal fluid leak from spinal puncture (G97.0)
colostomy malfunction (K94.0-)
disorders of fluid and electrolyte imbalance (E86-E87)
functional disturbances following cardiac surgery (I97.0-I97.1)
intraoperative and postprocedural complications of specified body systems (D78.-, E36.-, E89.-, G97.3-, G97.4, H59.3-, H59.-, H95.2-, H95.3, I97.4-, I97.5, J95.6-, J95.7, K91.6-, L76.-, M96.-, N99.-)
ostomy complications (J95.0-, K94.-, N99.5-)
postgastric surgery syndromes (K91.1)
postlaminectomy syndrome NEC (M96.1)
postmastectomy lymphedema syndrome (I97.2)
postsurgical blind-loop syndrome (K91.2)
ventilator associated pneumonia (J95.851)
Use additional code—
code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
code(s) to identify the specified condition resulting from the complication
code to identify devices involved and details of circumstances (Y62-Y82)

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.

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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