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R78.8 ICD-10-CM Code: Finding of other specified substances, not normally found in blood

Compare with another code for R78.8Check this code on a claim

Billing Status: NO. This is a non-billable ICD-10-CM code: report a more specific billable code beneath it.

Coding at a Glance

Tabular directives
8 Excludes2 · 1 use-additional code

Not billable · FY2027A non-billable heading in the tabular list: report a more specific code beneath it.

What you need to know

Source: CMS/NCHS Official ICD-10-CM tabular notes, quoted. From the CMS/NCHS tabular list for the release in force. A note the category or block publishes applies to this code too, and is marked with where it comes from.

Use additional codefrom R78Report with this code when documented
  • Use additional code to identify any retained foreign body, if applicable (Z18.-)
Excludes2Not included here; may be reported together
  • mental or behavioral disorders due to psychoactive substance use (F10-F19) (from R78)
  • abnormal findings on antenatal screening of mother (O28.-) (from R70-R79)
  • abnormalities of lipids (E78.-) (from R70-R79)
  • abnormalities of platelets and thrombocytes (D69.-) (from R70-R79)

+4 more in Instructions

Where it sits Source: CMS/NCHS

Under:Chapter 18: Symptoms, Signs and Abnormal Clinical and Laboratory Findings, Not Elsewhere ClassifiedR70-R79 Abnormal findings on examination of blood, without diagnosisR78 Findings of drugs and other substances, not normally found in blood

Codes under R78.8 (2)

  • R78.81BacteremiaBillable
  • R78.89Finding of other specified substances, not normally found in bloodBillable

Most relevant related codes MedCoder-derived

Read off the official notes above and this code’s own position in the tabular list. Which to report is a documentation question; Compare shows the two side by side.

CompareCheck ClaimView Related Codes

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for R78.8 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2027Effective: October 1, 2026

Trace:FY2027 changesChange historyRelease, file and checksum

Notes without a marker are published on R78.8 itself; “inherited from” names the category or block whose note applies here.

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

Use Additional Code

Supplementary codes the tabular list directs you to add.

  • Use additional code to identify any retained foreign body, if applicable (Z18.-)

Source: inherited from R78

Coder workflow for R78.8

MedCoder structured workflow — derived from this code’s own official record

Before you code R78.8

  1. R78.8 is not reportable as written. Select the more specific code beneath it that the documentation supports. Codes are reported to the highest level of specificity the classification provides (Guidelines I.B.2).

    ReviewR78.81, R78.89

    See the relationships section · Guide: How to choose an ICD-10-CM code →

  2. Check whether an established diagnosis that explains this sign or symptom is documented. If one is, review whether the documented diagnosis changes the coding pathway: a symptom that is integral to a confirmed diagnosis is not reported separately, while one not routinely associated with it may be. Signs and symptoms are reported when no definitive diagnosis is established (Guidelines I.B.4, I.B.5, I.B.6, I.C.18.b).

    Guide: Symptom code vs confirmed diagnosis →

Choose the right path

  1. Does the documentation support one of the more specific codes beneath R78.8?
    Yes → Select that code and continue the checks below on its own page.
    No → R78.8 cannot be reported as written. Where the codes beneath it include an unspecified code, that code applies when the record goes no further; otherwise query for the missing detail.

    ReviewR78.81, R78.89

  2. Is an established diagnosis that explains this sign or symptom documented?
    Yes → Review whether the documented diagnosis changes the coding pathway: a symptom integral to it is not reported separately.
    No → Continue — the sign or symptom code stands when no definitive diagnosis is established.

Report the code beneath R78.8 that the documentation supports, not R78.8 itself. Then work the Use Additional Code note, and confirm that code is valid for the date of service on its own page.

Documentation check

The provider’s diagnostic statement
Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).
The conditions the Use Additional Code note names
Reported with this code when documented; a conditional instruction (“if applicable”, “if known”) applies only when the record supports it.
Any detail beyond this code’s title
What the record states that a more specific code would capture — or its absence, which itself supports the unspecified code.

Official instructions as workflow

  • Excludes2 — not part of R78.8(8 notes)

    Coding workflow: The conditions named in this note are not included in R78.8. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

    CompareO28, E78, D69

    See the official tabular notes · Guidelines I.A.12.b

  • Use Additional Code — after identifying R78.8(1 note)

    Coding workflow: Check whether the documentation supports the additional code(s) the note names, and report them with R78.8 when it does. Where the instruction is conditional (“if applicable”, “if known”), it applies only when the record documents the condition.

    ReviewZ18

    See the official tabular notes · Guidelines I.A.13

Coding decision scenarios

Pattern scenarios for this code’s structure — decision rules, not clinical cases

Documentation: The sign or symptom is documented, and the same record establishes a diagnosis that routinely includes it.

Coding question: Is the code beneath R78.8 reported in addition to the diagnosis?

Path: Review the documented diagnosis and whether the classification treats this finding as integral to it.

Reason: Signs and symptoms integral to a confirmed diagnosis are not coded separately; those not routinely associated with it may be reported when present (Guidelines I.B.5, I.B.6, I.C.18.b).

Documentation: A condition the Use Additional Code note names is documented.

Coding question: Is a second code reported with the code beneath R78.8?

Path: Review the Use Additional Code note and the code it names.

Reason: The additional code is reported when the record documents the condition; a conditional instruction applies only when its condition is met (Guidelines I.A.13).

ReviewZ18

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Don’t confuse R78.8 with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of R78.8 — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

  • R78.9— Specificity relationship (Review)

    Overlapping diagnoses in the same category.

    Overlapping codes in the same category — the documentation decides which is the more specific fit.

    What moves you there: A record that documents no more than “Finding of unspecified substance, not normally found in blood” takes R78.9; specificity in the record moves it back here.

    Full comparison: R78.8 vs R78.9 →

  • F10— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of mental or behavioral disorders due to psychoactive substance use adds F10; it is not part of this code and both may be reported when both are documented.

    Full comparison: R78.8 vs F10 →

  • F19— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of mental or behavioral disorders due to psychoactive substance use adds F19; it is not part of this code and both may be reported when both are documented.

    Full comparison: R78.8 vs F19 →

  • O28— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of abnormal findings on antenatal screening of mother adds O28; it is not part of this code and both may be reported when both are documented.

    Full comparison: R78.8 vs O28 →

  • E78— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of abnormalities of lipids adds E78; it is not part of this code and both may be reported when both are documented.

    Full comparison: R78.8 vs E78 →

  • D69— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of abnormalities of platelets and thrombocytes adds D69; it is not part of this code and both may be reported when both are documented.

    Full comparison: R78.8 vs D69 →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Coding context

Guidelines, coding notes, decision aids, relationships (with MS-DRG and CCSR classification), hierarchy, HCC, coverage and the context map: what a coder reaches for after the core. Each section names whether it is official source data, a MedCoder-derived relationship or MedCoder editorial.

Code Overview

Finding of other specified substances, not normally found in blood is a non-billable ICD-10-CM category code (R78.8). A more specific billable subcode must be selected for claims submission.

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Verify Before Coding

  • Not billable as written — a more specific code is required: R78.81, R78.89.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder-derived relationships — computed from published CMS and AHRQ datasets

Other codes that name R78.8 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 8 Excludes2 notes: R83 — Abnormal findings in cerebrospinal fluid (via R78.-), R83-R89 — Abnormal findings on examination of other body fluids, substances and tissues, without diagnosis (R83-R89) (via R78.-), R84 — Abnormal findings in specimens from respiratory organs and thorax (via R78.-), R85 — Abnormal findings in specimens from digestive organs and abdominal cavity (via R78.-), R86 — Abnormal findings in specimens from male genital organs (via R78.-), R87 — Abnormal findings in specimens from female genital organs (via R78.-), R88 — Abnormal findings in other body fluids and substances (via R78.-), R89 — Abnormal findings in specimens from other organs, systems and tissues (via R78.-).

These codes’ tabular lists name this diagnosis as distinct — both may be reported when both are documented.

Referenced by 1 Use Additional Code instruction: Z02.83 — Encounter for blood-alcohol and blood-drug test (via R78.-).

These codes instruct coders to additionally report this code when it applies.

Contextual Map

Every relationship of R78.8 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run R78.8 with these 9 related codes in Claim Check

Hierarchy

Referenced by Excludes2 notes

Referenced by Use Additional Code instructions

Nearest codes (15)

Change history (3)

Reference

Index terms and tables, published questions and FAQ, every source behind this page with its release and checksum, the date-of-service check and the complete change history.

Common coding questions

MedCoder editorial

Can R78.8 be billed directly?

No. R78.8 (Finding of other specified substances, not normally found in blood) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2027 tabular list, index and tables, effective October 1, 2026 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v44.0 (October 2026) Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder-derived relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary and FAQ answers MedCoder editorial explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

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

Labels on this page: Official source data · MedCoder-derived relationship · MedCoder editorial explanation. How to read the labels · All data sources and release dates · CMS coding rules

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "R78.8 — Finding of other specified substances, not normally found in blood." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/r78.8-finding-of-other-specified-substances-not-normally-found-in-blood

Change history

Changed in FY2027, the release in force: Use Additional Code note added; Use Additional Code note removed.

  • FY2027 — October 1, 2026
    Use Additional Code note added
    code to identify any retained foreign body, if applicable (Z18.-)
    FY2027 changes
  • FY2027 — October 1, 2026
    Use Additional Code note removed
    code to identify the any retained foreign body, if applicable (Z18.-)
    FY2027 changes
  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Finding of other specified substances, not normally found in blood

Nearest Codes in This Family

Official ICD-10-CM classifications closest to R78.8 in its code family, with their registry titles.

View all codes in the R78 family