Chapter 10 — Further Reading

Tier 1 — Verified canonical sources

ICD-10-CM Official Guidelines, Section I.C — chapter-specific guidelines. This chapter is a reading of six of them. The ones covered here:

• I.C.1 — infectious and parasitic diseases, including the HIV rules and the sepsis sequencing. This is the most-revised subsection in the guidelines and the one to re-read annually.
• I.C.2 — neoplasms, including the sequencing rules for chemotherapy, immunotherapy, radiation, complications, and the Z85 history codes.
• I.C.3 — blood and blood-forming organs.
• I.C.4 — endocrine, including the diabetes guidance and the type-2 default.
• I.C.5 — mental, behavioral, and neurodevelopmental disorders, including the substance-use hierarchy.
• I.C.6 — nervous system, including the G89 pain guidance.

Read I.C.1 and I.C.2 in full. Between them they contain the two most-tested and most-argued sequencing rules in diagnosis coding, and they are a few pages each.

AHA Coding Clinic. Subscription. Sepsis, neoplasm sequencing, and the diabetes "with" convention are among the most frequently addressed topics in its history, and a great many questions this chapter raises have been answered there specifically.

The Table of Neoplasms and the ICD-10-CM Alphabetic Index, as published in the code set — including the morphology entries that govern over the table (§10.4).

CMS and NCHS ICD-10-CM files and addenda. The diabetes long-term-drug-therapy status codes and the dementia categories have both been revised; the addenda are where you see what changed.

HHS Office for Civil Rights guidance on HIPAA, and — for §10.8's compliance note — the federal regulations governing the confidentiality of substance use disorder patient records, which impose requirements beyond HIPAA including on redisclosure. If your organization touches behavioral health or substance use treatment, this is required reading and a summary is not adequate preparation.

State statutes governing disclosure of HIV status. These vary and frequently exceed the federal baseline. §10.2's compliance note is one of the places in this book where "verify locally" is load- bearing rather than boilerplate.

Tier 2 — Attributed, specifics unverified

Sepsis consensus definitions. The international consensus conference definitions — including the SIRS-based framework and the later definition commonly called Sepsis-3 — are published in the medical literature and are the basis of Case Study 1. Read at least the abstract of the current one; it will explain a great deal about why physician documentation looks the way it does.

Clinical documentation integrity literature on sepsis. Sepsis is a standing CDI focus for exactly the reason Case Study 1 describes, and the practitioner literature on how to query it well is unusually good.

Research on sepsis incidence and coding practice. The disentangling of "more sepsis" from "more sepsis coding" is an active and genuinely hard research question. Any trend figure should be read with its methodology.

AAPC and AHIMA material on neoplasm coding and on diabetes coding. Both publish substantial free explanatory content, and both areas benefit from a second explanation.

Risk-adjustment coding guidance from professional organizations, on the specific question of recapture processes and history codes. Case Study 2's failure mode is well known in that literature.

Specialty society coding guidance — oncology, endocrinology, infectious disease, and pain medicine societies all publish material on the categories their members use most, and it is frequently the most practical guidance available.

Tier 3 — Illustrative and constructed

Every clinical scenario in this chapter — the four sepsis scenarios in §10.3, the four diabetes scenarios in §10.6, the five charts in §10.10, and all exercise vignettes. Constructed. The codes are real; the clinical situations are invented.

The Table of Neoplasms excerpt in §10.4 — a real row shown in the real column order, abridged from a table that runs many pages.

Case Study 2 in its entirety — the primary care group, its recapture process, and the breast carcinoma coded as active for five consecutive years. Constructed; the failure mode is documented in risk-adjustment audit practice.

Two things worth doing

Read Section I.C.1 and I.C.2 in full. A few pages each, and between them they contain most of what gets argued about in diagnosis coding.

Then find one sepsis chart and one neoplasm chart in your own setting and code them against those guidelines with the document open. The gap between reading a rule and applying it is where the skill lives, and these two areas are where that gap is widest.