D49.9
Neoplasm of unspecified behavior of unspecified site
Billable FY2026 2025-10-01 → 2026-09-30
This is the unspecified option. 9 more
specific codes sit alongside it. Worth
checking whether the documentation supports one of them.
Exclusions 1 never code together
Instructional notes 13
D49code
Notes
- Category D49 classifies by site neoplasms of unspecified morphology and behavior. The term 'mass', unless otherwise stated, is not to be regarded as a neoplastic growth.D49
Includes
- 'growth' NOS
- neoplasm NOS
- new growth NOS
- tumor NOS
C00-D49chapter
Notes
- Functional activity
- All neoplasms are classified in this chapter, whether they are functionally active or not. An additional code from Chapter 4 may be used, to identify functional activity associated with any neoplasm.
- Morphology [Histology]
- Chapter 2 classifies neoplasms primarily by site (topography), with broad groupings for behavior, malignant, in situ, benign, etc. The Table of Neoplasms should be used to identify the correct topography code. In a few cases, such as for malignant melanoma and certain neuroendocrine tumors, the morphology (histologic type) is included in the category and codes.
- 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 mentioned, e.g., ectopic pancreatic malignant neoplasms are coded to pancreas, unspecified (C25.9).C25.9
Index entries leading here 15
- Arthropathy M12.9
- in (due to)
- neoplastic disease NOS (see also Neoplasm) D49.9
- in (due to)
- Ataxia, ataxy, ataxic R27.0
- Atrophy, atrophic (of)
- systemic affecting central nervous system
- in
- neoplastic disease D49.9
- in
- systemic affecting central nervous system
- Compression
- Palsy G83.9
- Osteitis — see also Osteomyelitis
- Dermatomyositis (acute) (chronic) — see also Dermatopolymyositis
- in (due to) neoplastic disease D49.9
- Dermatopolymyositis M33.90
- in neoplastic disease D49.9
- Encephalopathy (acute) G93.40
- in (due to) (with)
- neoplastic disease (see also Neoplasm) D49.9
- in (due to) (with)
- Syndrome — see also Disease
- Myasthenia G70.9
- syndrome
- in
- neoplastic disease D49.9
- in
- syndrome
- Polyneuropathy (peripheral) G62.9
- in (due to)
- neoplastic disease D49.9
- in (due to)
- Myelopathy (spinal cord) G95.9
- in (due to)
- neoplastic disease D49.9
- in (due to)
- Neuromyopathy G70.9
- paraneoplastic (see also, Neoplasm, by site, if known) D49.9
- Neuropathy, neuropathic G62.9
- paraneoplastic (sensorial) (Denny Brown) (see also, Neoplasm, by site, if known) D49.9
Alongside this code 9 same parent — D49
D49.0 Neoplasm of unspecified behavior of digestive system D49.1 Neoplasm of unspecified behavior of respiratory system D49.2 Neoplasm of unsp behavior of bone, soft tissue, and skin D49.3 Neoplasm of unspecified behavior of breast D49.4 Neoplasm of unspecified behavior of bladder D49.5 Neoplasm of unsp behavior of other genitourinary organs category D49.6 Neoplasm of unspecified behavior of brain D49.7 Neoplm of unsp behav of endo glands and oth prt nervous sys D49.8 Neoplasm of unspecified behavior of other specified sites category
Medications 1
MED-RT files conditions by MeSH, which carves the world differently from ICD-10. These are name matches on this code's description, offered as candidates — not as an assertion that they are this code.
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.