C72.0 (Malignant neoplasm of spinal cord)
compared with
D43.4 (Neoplasm of uncertain behavior of spinal cord),
from the official CMS tabular data.
Summary
These codes name the same anatomical site (conus medullaris) with a different neoplasm behavior, so the documented behavior decides which one applies.
MedCoder-derived
What is different?
Title wording.The titles share “of spinal cord”; C72.0 says “Malignant neoplasm” where D43.4 says “Neoplasm of uncertain behavior”.
Registry fact
Can these codes be reported together?
One column applies.C72.0 and D43.4 name the same anatomical site (conus medullaris) with a different neoplasm behavior. From the CMS/CDC Table of Neoplasms: the behavior documented for that site — malignant primary, secondary, carcinoma in situ, benign, uncertain or unspecified — decides which column, and therefore which code, applies.
MedCoder-derived
Is there an Excludes1 relationship?
None.Neither entry carries an Excludes1 note that names the other code.
Official rule
Is there an Excludes2 relationship?
None.Neither entry carries an Excludes2 note that names the other code.
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?
Yes.Same site, different neoplasm behavior. C72.0 and D43.4 name the same anatomical site (conus medullaris) with a different neoplasm behavior.
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
Same site, different neoplasm behavior.C72.0 and D43.4 name the same anatomical site (conus medullaris) with a different neoplasm behavior.
From the CMS/CDC Table of Neoplasms: the behavior documented for that site — malignant primary, secondary, carcinoma in situ, benign, uncertain or unspecified — decides which column, and therefore which code, applies.
What to review
Pick the column of the Table of Neoplasms that matches the behavior documented for the site.
The behavior documented for the site — malignant primary, secondary, carcinoma in situ, benign, uncertain or unspecified — decides which column of the neoplasm table, and therefore which code, applies.
Source / rule
CMS Table of Neoplasms
Official guidance behind these answers
Section I.C.2 — Chapter 2: Neoplasms (C00-D49 ) · applies to: Table of Neoplasms
General Guidelines Chapter 2 of the ICD-10-CM contains the codes for most benign and all malignant neoplasms. Certain benign neoplasms, such as prostatic adenomas, may be found in the specific body system chapters. To properly code a neoplasm, it is necessary to determine from the record if the neoplasm is benign, in-situ, malignant, or of uncertain histologic behavior. If malignant, any secondary (metastatic) sites should also be determined. Primary malignant neoplasms overlapping site boundaries A primary malignant neoplasm that overlaps two or more contiguous (next to each other) sites should be classified to the subcategory/code .8 ('overlapping lesion'), unless the combination is specifically indexed elsewhere. For multiple neoplasms of the same site that are not contiguous such as tumors in different quadrants of the same breast, codes for each site should be assigned. Malignant neoplasm of ectopic tissue Malignant neoplasms of ectopic tissue are to be coded to the site of origin mentioned, e.g., ectopic pancreatic malignant neoplasms involving the stomach are coded to malignant neoplasm of pancreas, unspecified (C25.9). The neoplasm table in the Alphabetic Index should be referenced first. However, if the histological term is documented, that term should be referenced first, rather than going immediately to the Neoplasm Table, in order to determine which column in the Neoplasm Table is appropriate. […]
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
Derived from the official CMS ICD-10-CM tabular data (FY2026). A coding-rule comparison, not billing advice:
payer-specific edits and medical-necessity policy are outside its scope.
All data sources