M1166 HCPCS Level II Code: Pathology report for tissue specimens produced from wide local excisions or re-excisions
HCPCS Level II code, maintained by CMS. Not a CPT code: CPT (HCPCS Level I) is a separate AMA code set that MedCoder does not publish. About HCPCS Level II
Compare with another codeCheck this code on a claim
Medicare Coverage & Payment
- CMS short descriptor: Path rpt tis spec wle/reexc
Source: CMS HCPCS Level II release. Coverage codes indicate how Medicare treats the code, not whether a specific claim will be paid; payer policy and documentation still govern.
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.
Contextual Map
Every relationship of M1166 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.
Nearest codes (40)
- M1146 — Ongoing care not clinically indicated because the patient needed a home program only, referral to another provider or facility, or consultation only, as documented in the medical record[Sibling]— CMS HCPCS Level II code set
- M1147 — Ongoing care not medically possible because the patient was discharged early due to specific medical events, documented in the medical record, such as the patient became hospitalized or scheduled for surgery[Sibling]— CMS HCPCS Level II code set
- M1148 — Ongoing care not possible because the patient self-discharged early (e.g., financial or insurance reasons, transportation problems, or reason unknown)[Sibling]— CMS HCPCS Level II code set
- M1149 — Patient unable to complete the neck fs prom at initial evaluation and/or discharge due to blindness, illiteracy, severe mental incapacity or language incompatibility, and an adequate proxy is not available[Sibling]— CMS HCPCS Level II code set
- M1150 — Current or prior left ventricular ejection fraction (lvef) less than or equal to 40% or documentation of moderately or severely depressed left ventricular systolic function[Sibling]— CMS HCPCS Level II code set
- M1151 — Patients with a history of heart transplant or with a left ventricular assist device (lvad)[Sibling]— CMS HCPCS Level II code set
- M1152 — Patients with a history of heart transplant or with a left ventricular assist device (lvad)[Sibling]— CMS HCPCS Level II code set
- M1153 — Patient with diagnosis of osteoporosis on date of encounter[Sibling]— CMS HCPCS Level II code set
- and 32 more
Change history
- January 1, 2023 — Added to the code set [Change history]— CMS release files (code change ledger)
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.
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, descriptors, coverage and pricing attributes Official source data
- CMS HCPCS Alpha-Numeric (ANWEB) release — October 2026 quarterly update Release, file and checksum · Publisher’s page
- Change history and date-of-service validity Official source data
- CMS HCPCS quarterly update files, ingested 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. "M1166 — Pathology report for tissue specimens produced from wide local excisions or re-excisions." HCPCS Level II October 2026. https://medcoder.ai/hcpcs/code/m1166-pathology-report-for-tissue-specimens-produced-from-wide-local-excisions
Change history
- January 1, 2023Added to the code setPathology report for tissue specimens produced from wide local excisions or re-excisionsHCPCS 2023 changes
Nearest Codes in This Family
Official HCPCS Level II classifications closest to M1166 in its code family, with their registry titles.
- M1161 — Patient had anaphylaxis due to the tetanus, diphtheria or pertussis vaccine any time on or before the patient's 13th birthday
- M1162 — Patient had encephalitis due to the tetanus, diphtheria or pertussis vaccine any time on or before the patient's 13th birthday
- M1163 — Patient had anaphylaxis due to the hpv vaccine any time on or before the patient's 13th birthday
- M1164 — Patients with dementia any time during the patient's history through the end of the measurement period
- M1165 — Patients who use hospice services any time during the measurement period
- M1167 — In hospice or using hospice services during the measurement period
- M1168 — Patient received an influenza vaccine on or between july 1 of the year prior to the measurement period and june 30 of the measurement period
- M1169 — Documentation of medical reason(s) for not administering influenza vaccine (e.g., prior anaphylaxis due to the influenza vaccine)
- M1170 — Patient did not receive an influenza vaccine on or between july 1 of the year prior to the measurement period and june 30 of the measurement period
- M1171 — Patient received at least one td vaccine or one tdap vaccine between nine years prior to the encounter and the end of the measurement period